Malicious PDF — malware analysis report

Static analysis result for SHA-256 93c4ef3f044ff0e0…

MALICIOUS

PDF

45.1 KB Created: 2020-08-14 00:12:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24b68b381f4fe37774b212e35d8ae1c4 SHA-1: 195913d697fcbbf058562b510e97361f6ec804b5 SHA-256: 93c4ef3f044ff0e0b2152c18016954c085c0ff27f0a6c31e446239868aabba3e
154 Risk Score

Malware Insights

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

The PDF contains a link to a malicious redirector, identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though heavily obfuscated, contains the string 'Score hero apk' and a URL that appears to be the target of the lure. The PDF also contains a large number of links to external PDFs hosted on Shopify, likely for SEO manipulation to improve search engine ranking for malicious content.

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.cc/pify?keyword=score+hero+apk
    • http://files.our-lady.org/uploads/1/3/1/3/131398242/mikanuziwusut-tulaselekoj-lofewixama-xupozubonam.pdf
    • http://files.growpches.com/uploads/1/3/0/7/130738822/414d7ea83fb7cd4.pdf
    • http://files.carissajoyrobinson.com/uploads/1/3/1/4/131453623/4040265.pdf
    • http://files.oahupix.com/uploads/1/3/2/7/132740586/9213877.pdf
    • http://files.disneyismylife.com/uploads/1/3/0/7/130738876/lotanilikabe_buwigifuxu_dadaga.pdf
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/jumizop.pdf
    • https://cdn.shopify.com/s/files/1/0433/9413/8277/files/andrology_books.pdf
    • https://cdn.shopify.com/s/files/1/0436/5916/5849/files/81989588979.pdf
    • https://cdn.shopify.com/s/files/1/0431/2160/6820/files/67899263573.pdf
    • https://cdn.shopify.com/s/files/1/0428/1057/2967/files/zipafo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71062637782.pdf
    • https://cdn.shopify.com/s/files/1/0431/6377/9240/files/47988406554.pdf
    • https://cdn.shopify.com/s/files/1/0439/6374/4414/files/nutrition_taco_bell.pdf
    • https://cdn.shopify.com/s/files/1/0431/6584/3620/files/british_and_american_english_spelling_differences.pdf
    • https://cdn.shopify.com/s/files/1/0447/4689/9607/files/puruxixaxifetuk.pdf
    • https://cdn.shopify.com/s/files/1/0436/4327/3369/files/kobumonub.pdf
    • https://cdn.shopify.com/s/files/1/0436/0637/6611/files/reading_comprehension_past_simple_and_continuous.pdf
    • https://cdn.shopify.com/s/files/1/0433/6471/2616/files/78679331552.pdf
    • https://cdn.shopify.com/s/files/1/0431/6954/6396/files/58709756467.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_off00007287.bin
6b6fc915976f29a7222bdc4aefd048c64ebbb47a4f6fb06b3be01aac65ceccdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7287 4980 bytes
font_01_sfnt_off00008367.bin
c38e7bc6c4c8769ad48a41ea82bb1aabf93d1760ff6b07757183940dd925d11a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8367 10592 bytes

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