Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e858877c28d72b5…

MALICIOUS

PDF

50.5 KB Created: 2020-08-31 21:00:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f3a23cf29b314471021d9ce8806c929 SHA-1: b76160d8966ceaf0e550c4853316830df04fd93e SHA-256: 1e858877c28d72b5fc4c8cf09006d028a7f7bb9a8397ba399ef4c53d02b0b983
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with a critical heuristic identifying a malicious redirector at 'https://ttraff.ru/wix?keyword=tempat++film+bioskop+indonesia+terbaru'. The document body, though heavily obfuscated, also contains this URL, suggesting it is the primary lure. The ML classifier strongly indicates maliciousness. The presence of numerous Shopify-hosted PDF links suggests a link farm designed to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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/wix?keyword=tempat++film+bioskop+indonesia+terbaru
    • https://cdn.shopify.com/s/files/1/0433/9800/4899/files/46081249038.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/buvigorunuwerara.pdf
    • https://cdn.shopify.com/s/files/1/0431/8858/4605/files/squarespace_mx_records.pdf
    • https://cdn.shopify.com/s/files/1/0438/5934/5573/files/m5r1_transmission_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/6212/4959/files/address_label_template_14_per_sheet_free.pdf
    • https://cdn.shopify.com/s/files/1/0440/4733/5574/files/32790915616.pdf
    • https://cdn.shopify.com/s/files/1/0429/3771/2806/files/limibawugigidug.pdf
    • https://cdn.shopify.com/s/files/1/0441/2270/1976/files/suxoxewizozisureme.pdf
    • https://cdn.shopify.com/s/files/1/0433/2873/3352/files/5910101828.pdf
    • https://cdn.shopify.com/s/files/1/0434/0305/1171/files/fememubonukifu.pdf
    • https://cdn.shopify.com/s/files/1/0436/2017/1936/files/auto_enrolment_postponement_letter_template.pdf
    • https://cdn.shopify.com/s/files/1/0439/5322/5883/files/edward_maya_stereo_love_mp4_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/1810/0637/files/direct_path_internet.pdf
    • https://cdn.shopify.com/s/files/1/0428/1755/2543/files/jepoxum.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000881a.bin
0032bd670f5bdf88eb12d9fd0966ac7b7dcf12e052afd9bc7cc33659dd5b42e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x881A 5340 bytes
font_01_sfnt_off00009a24.bin
1d574513318654bac3b2569ace41d4c4501f64fee381a067be6b5990e72e9818
pdf-font-stream PDF embedded font (sfnt) at offset 0x9A24 10296 bytes