Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ed94a1238be3a67…

MALICIOUS

PDF

119.7 KB Created: 2020-08-08 11:58:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a12b8a502b5939b0c7c8395a75293199 SHA-1: 33097a45e1b602e161a8d4c21f5af164d11c1f68 SHA-256: 7ed94a1238be3a67f923f8ec2494161c61e92591110d0a3d5a4a88439d108c64
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many of which lead to a redirector service at 'ttraff.com'. This service appears to be part of an SEO link farm designed to lure victims with search terms like 'malayalam bible study acts pdf'. The ML classifier strongly indicated maliciousness, and the presence of a redirector link confirms a malicious intent to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.com/pify?keyword=malayalam+bible+study+acts+pdf In PDF document text
    • http://fuzuf.lorrainechandler.com/uploads/1/3/1/0/131070450/6592731.pdfIn PDF document text
    • http://files.hatha-house.com/uploads/1/3/1/4/131438641/meronazomagavo_tuwibajo_sujefi_zoleti.pdfIn PDF document text
    • http://nagifibi.greathorwoodhistory.org/uploads/1/3/0/7/130740013/4ba74f.pdfIn PDF document text
    • http://files.crowstonephoto.com/uploads/1/3/0/7/130775992/pijigowezinibu.pdfIn PDF document text
    • http://files.foundationsoffuninfirst.com/uploads/1/3/0/8/130814118/93036.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00014cf7.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00014cf7.bin)
    • http://smc.org.in)MeeraRegularMeera2016SMC7.0.0+20171102HussainIn extracted file (font_01_sfnt_off00015f7d.bin)
    • http://smc.org.inhttp://smc.org.inIn extracted file (font_01_sfnt_off00015f7d.bin)
    • https://cdn.shopify.com/s/files/1/0430/7966/3765/files/52674699677.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9102/4280/files/gapimutepu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/3416/2853/files/building_construction_file_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1754/3585/files/1711755864.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5393/0901/files/sigolokikasesajizowe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4931/2666/files/652363555.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8333/2773/files/fundamentals_of_economics_ignou.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2120/4631/files/38538529213.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4582/1333/files/54648734066.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3331/2925/files/45143331583.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9496/6429/files/convert_int_to_string_c.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn extracted file (font_00_sfnt_off00014cf7.bin)
    • https://gitlab.com/smc/meera/blob/master/COPYINGIn extracted file (font_01_sfnt_off00015f7d.bin)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CF7 5452 bytes
SHA-256: 8fbb62dcc07391e95e16938d02d58ebf1316154237ddbf151e2f09715061cc0f
font_01_sfnt_off00015f7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F7D 21188 bytes
SHA-256: 4cdfe2e254fbff11b085ca74f8cbfe7f0fedc3889d0c7080cf34bfa12fdc289f
font_02_sfnt_off00019eb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19EB8 15560 bytes
SHA-256: d33b9e3ee68d3ef2f385835b900fe12929796c0f05de254b6da977160b7d2603