Malicious PDF — malware analysis report

Static analysis result for SHA-256 83af489637f7dd72…

MALICIOUS

PDF

43.9 KB Created: 2020-08-24 15:41:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24457b1748fc374387c8d5f04c7831ae SHA-1: 4d6e31a9656e99b7648e9bff6c03a48c2effb8d7 SHA-256: 83af489637f7dd72801849145d1085ef5bfaef5c20e0a7ab6732a3403d940004
174 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to potentially malicious redirectors and a large number of external PDF files, suggesting a link farm or SEO abuse tactic. The document body, though heavily obfuscated, contains a URL that is flagged as a malicious redirector. The presence of callback phishing lures further indicates a malicious intent to deceive the user into interacting with malicious 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.cc/pify?keyword=kiwisaver+first+home+buyers+guide
    • http://dedumugo.vdmusic.net/uploads/1/3/1/4/131437508/7646967.pdf
    • http://files.rowdygalmudhud.com/uploads/1/3/1/4/131438449/mabef.pdf
    • http://files.thescribblersjournal.com/uploads/1/3/1/4/131437834/vowelapusomip_fosezunib_nunipazi_webij.pdf
    • http://wigizolo.casting4growth.com/uploads/1/3/0/7/130738850/tuwawosulom-luzasotuxu.pdf
    • http://vavuse.returntoyourself.org/uploads/1/3/1/3/131380213/d9a28b81e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/8502/7746/files/72091162249.pdf
    • https://cdn.shopify.com/s/files/1/0431/0158/5570/files/gawoperojijijipobumakezu.pdf
    • https://cdn.shopify.com/s/files/1/0439/5663/3758/files/boot_configuration_data.pdf
    • https://cdn.shopify.com/s/files/1/0432/8616/7702/files/joseku.pdf
    • https://cdn.shopify.com/s/files/1/0428/9495/0556/files/31271292713.pdf
    • https://cdn.shopify.com/s/files/1/0433/0238/7867/files/zobemoboturuzuwol.pdf
    • https://cdn.shopify.com/s/files/1/0436/2610/2947/files/76437919409.pdf
    • https://cdn.shopify.com/s/files/1/0432/0903/1840/files/bumetotekez.pdf
    • https://cdn.shopify.com/s/files/1/0436/9815/9769/files/ridalumoteruver.pdf
    • https://cdn.shopify.com/s/files/1/0430/6026/5117/files/3659120121.pdf
    • https://cdn.shopify.com/s/files/1/0428/6837/5719/files/60710215453.pdf
    • https://cdn.shopify.com/s/files/1/0427/6856/4380/files/72202129485.pdf
    • https://cdn.shopify.com/s/files/1/0428/4776/4636/files/artist_statement_template.pdf
    • https://cdn.shopify.com/s/files/1/0432/7853/2761/files/root_external_2_internal.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_off00006a9e.bin
6fec2c086e92adead58cd1d967bdbb76ef90b8b75a4c075d4cf571ec0635a53e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A9E 5652 bytes
font_01_sfnt_off00007dda.bin
64d734823451e527ce1aceb8de5d7694f2d140fe33fa002c355cf24d3edb33ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DDA 10824 bytes

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