Malicious PDF — malware analysis report

Static analysis result for SHA-256 8843621f6b321454…

MALICIOUS

PDF

42.1 KB Created: 2020-08-12 17:33:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 49f9032b766bbb1865d020f01db1b0b7 SHA-1: 2f6873c89778140e1e33dfd486ad8efa44881718 SHA-256: 8843621f6b321454129d6b67b4d2d5d26dd0af1c8508d5866cfa69c7ef891f2f
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 ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL https://ttraff.cc/pify?keyword=catzos+blancos+pdf, which is flagged as a malicious redirector. This suggests the document's primary purpose is to drive traffic to malicious 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.cc/pify?keyword=catzos+blancos+pdf
    • http://files.bethanylutheranrlf.com/uploads/1/3/1/3/131381819/sizumomonogup.pdf
    • http://files.carburettormagazine.com/uploads/1/3/0/9/130969190/potatagupejekiga.pdf
    • http://files.paultraviscrybaby.com/uploads/1/3/1/3/131398019/7abac9156237301.pdf
    • http://files.agorapublications.net/uploads/1/3/2/6/132682570/4da5af8.pdf
    • http://files.eldiablo.ca/uploads/1/3/0/8/130874019/xezupuruf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/9923/5228/files/sipifuvexadanarologotenu.pdf
    • https://cdn.shopify.com/s/files/1/0429/8070/4405/files/64383897992.pdf
    • https://cdn.shopify.com/s/files/1/0428/7270/1095/files/exam_essentials_cae_practice_tests_key.pdf
    • https://cdn.shopify.com/s/files/1/0435/6918/4931/files/spelling_test_practice.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/51268900441.pdf
    • https://cdn.shopify.com/s/files/1/0432/7302/7749/files/pudobesojewosuxivebe.pdf
    • https://cdn.shopify.com/s/files/1/0432/7571/4715/files/43880010674.pdf
    • https://cdn.shopify.com/s/files/1/0438/2595/4973/files/vujibofofavajilobemojus.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/voxetevew.pdf
    • https://cdn.shopify.com/s/files/1/0435/7901/5327/files/50322553598.pdf
    • https://cdn.shopify.com/s/files/1/0433/1657/6424/files/83059325899.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_off00006613.bin
3761252f64c2ad11aca0eb79ed624d9ba5f3aa9667331e2bb3962d27710d4a4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6613 5148 bytes
font_01_sfnt_off000077ad.bin
ea3686f56ee2af90b399c78a1174a48cca8b5830c44d02d6749f0c94699554da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77AD 10760 bytes

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