Malicious PDF — malware analysis report

Static analysis result for SHA-256 b217b67ceda7cb47…

MALICIOUS

PDF

40.5 KB Created: 2020-08-21 22:33:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a0395ade97e06675c9a8677836bc606 SHA-1: f24a46e10f7d50758969d48ab6386942c0805686 SHA-256: b217b67ceda7cb47932cfc8b41b42aa9834c4e4a360aac2f6a720777bea2b73e
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector at 'ttraff.ru'. The document body, though heavily obfuscated, contains text referencing 'Airfoillabs 172 manual' and the malicious URL, suggesting a lure to a phishing or malware distribution site. The presence of a large number of external PDF links, many hosted on Shopify, further supports the SEO link farm heuristic.

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/pify?keyword=airfoillabs+172+manual
    • http://files.sswonline.com/uploads/1/3/1/1/131163879/c23e36c820b650a.pdf
    • https://cdn.shopify.com/s/files/1/0437/0399/2474/files/79269870176.pdf
    • https://cdn.shopify.com/s/files/1/0432/0290/4222/files/wovatezafabutexow.pdf
    • https://cdn.shopify.com/s/files/1/0452/8714/5634/files/relogupoj.pdf
    • https://cdn.shopify.com/s/files/1/0434/0505/0021/files/83295800464.pdf
    • https://cdn.shopify.com/s/files/1/0433/8650/3324/files/miresaw.pdf
    • https://cdn.shopify.com/s/files/1/0433/0084/7781/files/48102875738.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/fenovogodopofadugid.pdf
    • https://cdn.shopify.com/s/files/1/0435/2281/8200/files/81483315877.pdf
    • https://cdn.shopify.com/s/files/1/0428/5834/8703/files/zezex.pdf
    • https://cdn.shopify.com/s/files/1/0439/0027/2792/files/rebecca_wright_io_tillett_wright.pdf
    • https://cdn.shopify.com/s/files/1/0438/6829/1232/files/cisco_jabber_12._7.pdf
    • https://cdn.shopify.com/s/files/1/0431/0722/1661/files/65544486486.pdf
    • https://cdn.shopify.com/s/files/1/0428/6880/1702/files/53139796953.pdf
    • https://cdn.shopify.com/s/files/1/0436/0162/5252/files/business_proposal_template.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xikosimuzewenox.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_off000061d9.bin
3c2f9a407a64a5ceee19fc702c624ba0ed91fae2387f0665d6cc45f2c4ab8b6b
pdf-font-stream PDF embedded font (sfnt) at offset 0x61D9 5308 bytes
font_01_sfnt_off000073d3.bin
7728bf7d2570b3bee87c0159d1768087d9d696ac2ef0abae34cc348cb98c5c45
pdf-font-stream PDF embedded font (sfnt) at offset 0x73D3 9840 bytes