Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a94b86ac71512c0…

MALICIOUS

PDF

42.8 KB Created: 2020-08-03 13:17:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d02124be1ad326e2ab9c90572db49f23 SHA-1: 9949296eba184bf3073d83b18aba86d804fab73b SHA-256: 5a94b86ac71512c0adb85d1dffa080e4eea18cc97c849672e45f546f20c9f6a3
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service known to host malicious content. The document body, though heavily obfuscated, contains URLs that appear to be part of a link farm designed to improve search engine ranking for malicious content. The ML classifier strongly indicates maliciousness, and the presence of numerous external links suggests an attempt to redirect the user to potentially harmful sites.

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=cambridge+certificate+of+proficiency+in+english+5+pdf
    • http://files.sruthilayaa.com/uploads/1/3/0/8/130874154/8f351c89dfb9d6.pdf
    • http://files.rfplfoundation.org/uploads/1/3/1/4/131437702/masebopepu-pilifuwi.pdf
    • http://files.greenwichsailing.com/uploads/1/3/0/7/130775983/godigimudovanuf-wajov-zekodogunimuf-bobuvir.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/39843759369.pdf
    • https://cdn.shopify.com/s/files/1/0437/8152/1560/files/88528192531.pdf
    • https://cdn.shopify.com/s/files/1/0439/5096/4904/files/37644174648.pdf
    • https://cdn.shopify.com/s/files/1/0434/1573/2381/files/robujegewarane.pdf
    • https://cdn.shopify.com/s/files/1/0433/6628/5462/files/puweduzipoturu.pdf
    • https://cdn.shopify.com/s/files/1/0433/3037/1738/files/3571845741.pdf
    • https://cdn.shopify.com/s/files/1/0432/3006/8894/files/bizoporufukazig.pdf
    • https://cdn.shopify.com/s/files/1/0435/3146/8951/files/97604894090.pdf
    • https://cdn.shopify.com/s/files/1/0428/5654/6467/files/orlando_weather_forecast_30_day.pdf
    • https://cdn.shopify.com/s/files/1/0427/9658/1020/files/mevisisipasitidaxase.pdf
    • https://cdn.shopify.com/s/files/1/0428/7938/5766/files/nofosatuliselebopisidu.pdf
    • https://cdn.shopify.com/s/files/1/0428/6971/9196/files/83832084151.pdf
    • https://cdn.shopify.com/s/files/1/0430/8389/0850/files/mivunenujowesipopeparozux.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/girotimovu.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_off00006705.bin
cd1f4e306f5500f931daa3e2d0776acd6a6406b1a60a30b6f8ce81da9cb9a956		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6705 5840 bytes
font_01_sfnt_off00007ac3.bin
18ddaa7fbd1032930099a4bd6fd0192cd41ef1d926335a5d641524a5979e9114		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AC3 10184 bytes

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