Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f440683fa65d193…

MALICIOUS

PDF

44.0 KB Created: 2020-08-31 04:19:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93ecac367a9c117a4760bd07204da839 SHA-1: 503f42e6800633423f1a052aa4acd1431141c3ad SHA-256: 9f440683fa65d193a3dcf5899a87404787f0f46a31c97be2b8dd061aa2b6a8ea
120 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, ttraff.com, which is disguised with text related to academic answers. This suggests a phishing or scam attempt. The file also contains a large number of embedded links, many pointing to static.usrfiles.com, which is flagged as a link farm. The primary malicious IOC is the redirector URL.

Heuristics 3

  • 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.
  • 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.com/wix?keyword=macromolecules+post+lab+answers
    • https://static.usrfiles.com/ugd/625844_4e0f5ea909f24e8580a02395f672dfdb.pdf
    • https://static.usrfiles.com/ugd/dfb5f8_6f180584879548bb9bf06cec6c018780.pdf
    • https://static.usrfiles.com/ugd/b8c837_6ab38440706a40fbb0be0d4e8ba6110b.pdf
    • https://static.usrfiles.com/ugd/4cf28d_1d45822bb57f4e0db0d5ace9a7fee5c6.pdf
    • https://static.usrfiles.com/ugd/b8c837_ba65f5c89cff4197a23abaab6bfae0a5.pdf
    • https://static.usrfiles.com/ugd/b8c837_565e142e74bb4bff947d7d6f5e03d185.pdf
    • https://static.usrfiles.com/ugd/fac845_8ada9d4f8cbc4b8888202a4e2238a178.pdf
    • https://static.usrfiles.com/ugd/74e905_22707714933e495b8c7e0b675ef4aba9.pdf
    • https://static.usrfiles.com/ugd/eaf48f_c274fadc37814bdc938b8690740523e3.pdf
    • https://cdn.shopify.com/s/files/1/0428/4622/4551/files/speed_control_of_induction_motor_using_pwm_technique.pdf
    • https://cdn.shopify.com/s/files/1/0437/1926/2357/files/wholesale_purchase_agreement_contract.pdf
    • https://cdn.shopify.com/s/files/1/0432/3937/5012/files/gaxawiv.pdf
    • https://cdn.shopify.com/s/files/1/0429/8237/5577/files/mapowenojuvoxixali.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_off00006157.bin
7d548d2b640d33e7449816c950d1ad853dad4bea3e2e25540243c88b7f3b151f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6157 5148 bytes
font_01_sfnt_off000072c9.bin
41fd7736e44ccc6850f0feb04e6a1477c02ce9bb2c03ae4f8549a24fc0cb0b89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72C9 10068 bytes
font_02_sfnt_off0000953a.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x953A 4324 bytes

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