Malicious PDF — malware analysis report

Static analysis result for SHA-256 a33b943ba383eb84…

MALICIOUS

PDF

44.7 KB Created: 2020-08-24 19:38:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f771b11ebd89a316503604852b86fc22 SHA-1: ae7c08093eba0e59bd26bde4ac09791a06929cba SHA-256: a33b943ba383eb841af4d812cd3cd0c614b9455a1dee5fd3cf597c1c286dce1b
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains multiple invisible links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. The presence of numerous external PDF links suggests an attempt to manipulate search engine results or distribute further 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.
  • Invisible PDF links to CAPTCHA-themed web lure high PDF_CAPTCHA_LINK_LURE
    PDF contains invisible clickable link annotations that point to a CAPTCHA/capcha-themed web path. This is a common phishing and ClickFix-style routing pattern: the PDF itself is inert, while the linked page performs the credential prompt or fake verification.
  • 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=betadine+scrub+and+paint+guidelines
    • http://files.shirelandscaping.com.au/uploads/1/3/0/8/130814052/duwoz.pdf
    • http://kabak.chrisball-student.com/uploads/1/3/1/0/131070894/1672640.pdf
    • http://files.americanexcellencepageants.com/uploads/1/3/0/9/130970012/1ec35733.pdf
    • http://bamizekux.sogchurch.net/uploads/1/3/2/8/132814439/6312de1ff.pdf
    • https://cdn.shopify.com/s/files/1/0461/5539/9331/files/venn_diagram_template_online.pdf
    • https://cdn.shopify.com/s/files/1/0431/7295/4269/files/witepemadu.pdf
    • https://cdn.shopify.com/s/files/1/0435/4169/2580/files/60543707036.pdf
    • https://cdn.shopify.com/s/files/1/0434/3100/2264/files/xinuxozeloravaw.pdf
    • https://cdn.shopify.com/s/files/1/0435/2075/3823/files/jexubefafomex.pdf
    • https://cdn.shopify.com/s/files/1/0433/4934/4421/files/can_bus_specification.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pifafesilepobusofamut.pdf
    • https://cdn.shopify.com/s/files/1/0432/2174/5822/files/arema_manual_for_railway_engineering.pdf
    • https://cdn.shopify.com/s/files/1/0432/0247/8237/files/advanced_java_all_programs.pdf
    • https://cdn.shopify.com/s/files/1/0430/5335/1066/files/joomla_extensions_templates.pdf
    • https://cdn.shopify.com/s/files/1/0438/2159/6834/files/history_of_ethnic_conflict_in_nigeria.pdf
    • https://cdn.shopify.com/s/files/1/0427/7328/2983/files/kebukekafovusumov.pdf
    • https://cdn.shopify.com/s/files/1/0432/7509/2132/files/vawep.pdf
    • https://cdn.shopify.com/s/files/1/0459/7710/8647/files/gsa_captcha_breaker_free.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_off00006b7f.bin
a1a36db6346c441f321147801c4c72311cd73f190cb6a0d8994f9675c1451cd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B7F 5428 bytes
font_01_sfnt_off00007dec.bin
08d7df03fff2ac38d81f61c31e5b02a3d67dcf369422d9e6ff44c15a1d791ce2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DEC 11480 bytes

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