Malicious PDF — malware analysis report

Static analysis result for SHA-256 e99b4f785f79a6fd…

MALICIOUS

PDF

46.5 KB Created: 2020-08-25 22:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19a9a4de2b0f36b41b20cc2dd9e11006 SHA-1: b16e30e1c3daf8efe30857c1dd464a18c84d44b8 SHA-256: e99b4f785f79a6fdb2e978eafaa1feb6d6bd15f29db1fda96a14573620e2b6d3
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one heuristic specifically identifying it as a PDF SEO link farm. The primary malicious link points to a redirector, suggesting a chain of redirection to potentially malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, limiting the analysis of direct execution behavior.

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=winston+operations+research
    • http://files.childrenschattermatters.com/uploads/1/3/1/1/131164552/sodegajadibipujak.pdf
    • http://bopuk.theaterinthepark.net/uploads/1/3/1/3/131397970/bigexawixalo.pdf
    • http://files.northernbugwear.ca/uploads/1/3/1/4/131407165/modofuda-tevuravikat-xejaduve-xewuzedalupus.pdf
    • http://files.doublebeehoney.com/uploads/1/3/0/8/130813730/gedurojerod.pdf
    • http://seriwe.huffmansflowersofthefield.com/uploads/1/3/0/7/130739892/jopegutoro.pdf
    • https://cdn.shopify.com/s/files/1/0431/9461/3924/files/30369180354.pdf
    • https://cdn.shopify.com/s/files/1/0431/8937/1044/files/zaxegawetoparat.pdf
    • https://cdn.shopify.com/s/files/1/0437/6195/9070/files/angola_civil_war.pdf
    • https://cdn.shopify.com/s/files/1/0435/6974/1983/files/pearson_world_history_assessment_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/0678/6725/files/xuposedobagutawevatebula.pdf
    • https://cdn.shopify.com/s/files/1/0437/9095/8749/files/40287301803.pdf
    • https://cdn.shopify.com/s/files/1/0429/2896/3747/files/sokiregoposaletefe.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/vixuzixaweji.pdf
    • https://cdn.shopify.com/s/files/1/0428/2161/5775/files/60394499468.pdf
    • https://cdn.shopify.com/s/files/1/0438/4056/9509/files/36701074695.pdf
    • https://cdn.shopify.com/s/files/1/0431/1256/2849/files/newafoji.pdf
    • https://cdn.shopify.com/s/files/1/0429/6710/5687/files/pufakebidemamefufo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004c83.bin
7b41c92fa54ffeca6b9d74067f38a075e9a34456e314152d95468cccfb3068d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C83 13008 bytes
font_01_sfnt_off00007670.bin
6699e18e83be1c5f0d08ddca0fc50caafcd0a66ad6536e2e761cab9f894df304		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7670 5004 bytes
font_02_sfnt_off00008770.bin
7f2e3364ac28753d4d14e227cffa8f61755f2229a5917989171c1bc8325e81de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8770 10240 bytes

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