Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac7e6c0cbad11556…

MALICIOUS

PDF

40.0 KB Created: 2020-09-05 19:21:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d406ef2777cfb7364a3d8ee3328afb0f SHA-1: 42dbcb5f8346c1c27e632e5e3c64964f163bde2e SHA-256: ac7e6c0cbad11556d9d6eb537ad1d7a911a3d4bae3907e2fea886f572a60ce82
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.club/wix?keyword=vertical+line+test+functions+worksheet', which is flagged as malicious. The presence of numerous links to static.usrfiles.com suggests a link farm for SEO poisoning, a common tactic to drive traffic to malicious sites. No scripts were extracted, limiting the analysis of direct payload execution.

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.club/wix?keyword=vertical+line+test+functions+worksheet
    • https://static.usrfiles.com/ugd/dfb5f8_5af73b64877b45a091f406b35e65f045.pdf
    • https://static.usrfiles.com/ugd/64d889_b6ae97a9cffb493cb2db982de8227802.pdf
    • https://static.usrfiles.com/ugd/909b15_3421b2cdf1ed47efb47e8a63be5586cc.pdf
    • https://static.usrfiles.com/ugd/b8c837_283fb3897a294bedabd8e8dd2706be84.pdf
    • https://static.usrfiles.com/ugd/a9e086_ca5725663a0e4ea78155c22d15767024.pdf
    • https://static.usrfiles.com/ugd/516793_8a7d5736396a4d34832ff4cb42782975.pdf
    • https://static.usrfiles.com/ugd/0047a4_70688ab0af8a4766b797ca10fd733d23.pdf
    • https://static.usrfiles.com/ugd/b8c837_b19415cbbbb84587b00bd428bcd33622.pdf
    • https://static.usrfiles.com/ugd/2e16aa_008287a1a802431a9c81b7a0703449af.pdf
    • https://static.usrfiles.com/ugd/c83fdb_3851445ad08e431d96a8696d6002bb4b.pdf
    • https://static.usrfiles.com/ugd/8e1900_a320b83136634acfb3bb0fee62afae94.pdf
    • https://static.usrfiles.com/ugd/e6092c_2233a4c04bf3442ea2b7501b3b73042a.pdf
    • https://static.usrfiles.com/ugd/37987b_dfedcb53fe7341eca8c2c462489dc867.pdf
    • https://cdn.shopify.com/s/files/1/0428/4874/7687/files/78247621540.pdf
    • https://cdn.shopify.com/s/files/1/0440/2325/1094/files/john_deere_l110_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/2352/4255/files/cantos_para_arrullar_al_nio_dios.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_off00005f67.bin
5bbd9da360ef55acdb4e6208516802e916e476acd7cfd7ef7b725f6255323529		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F67 5088 bytes
font_01_sfnt_off000070c6.bin
d52c9c9681314bdb74cdb8a7e7e29b55bdfc1e44eee793c85da99c5f8934c33d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70C6 9980 bytes

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