Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d8441b551a2b6c1…

MALICIOUS

PDF

33.2 KB Created: 2020-08-22 07:21:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6669dfccc9b7c9af3c78ce743e20e990 SHA-1: c46d00900d2173b76b9e2aaae4fccd98128526dd SHA-256: 0d8441b551a2b6c1442c320c5bb069ac958f06d5d8eb10691e2626e94dbddca3
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which are algorithmically generated and point to a known malicious redirector infrastructure. The document body, though obfuscated, contains text related to 'Galcon 9001d irrigation timer manual' and includes the malicious redirector URL, suggesting a lure to trick users into visiting potentially harmful sites. The ML classifier strongly indicates maliciousness.

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.ru/pify?keyword=galcon+9001d+irrigation+timer+manual
    • http://nolazunuk.cptcinteriordesign.com/uploads/1/3/1/4/131407089/1bf1f6bfe20.pdf
    • http://pakepata.theesteemprojects.com/uploads/1/3/0/7/130776054/2c2da997dbec6.pdf
    • http://files.lindjonath.com/uploads/1/3/1/4/131483307/843ebdf882bf.pdf
    • http://gapenep.mikericesports.com/uploads/1/3/1/4/131438684/nuvumigub.pdf
    • http://files.pridefightingchampionshipstribute.com/uploads/1/3/1/4/131437848/tokijupelewa_fobiduv_masamowaso.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/3042/9346/files/77945410356.pdf
    • https://cdn.shopify.com/s/files/1/0440/7784/2584/files/dategajezukaga.pdf
    • https://cdn.shopify.com/s/files/1/0437/0789/1863/files/bosch_serie_4_smv46gx01g_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/2652/0987/files/abhorsen_series.pdf
    • https://cdn.shopify.com/s/files/1/0434/0813/0200/files/sciatica_home_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0436/1771/4338/files/fallout_4_performance_mods.pdf
    • https://cdn.shopify.com/s/files/1/0432/8305/4757/files/acknowledgement_for_ojt_narrative_report.pdf
    • https://cdn.shopify.com/s/files/1/0435/5053/9940/files/american_streets_address.pdf
    • https://cdn.shopify.com/s/files/1/0432/3239/5426/files/capitec_learnership_2020_application_form.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004488.bin
8c3228a7bc6c1371938d4fef75bf8ce7fa2228e1250bcb971e298bb2ea89c110		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4488 5464 bytes
font_01_sfnt_off00005705.bin
ba4e3b557fbd03a0b2e79542ad9913de107efb978470b42ee86d065209811057		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5705 9616 bytes

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