Malicious PDF — malware analysis report

Static analysis result for SHA-256 756e3c14bbaea321…

MALICIOUS

PDF

51.9 KB Created: 2020-09-01 05:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3e7e7787e59ace3b0de08ad6b94131ae SHA-1: 1593841a07a8b4a34b59d631f3f8892c6b768ee4 SHA-256: 756e3c14bbaea3210f81f72505197648880847eb12540d77f78a310767f963e0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure related to 'Columbia pictures font' and includes the malicious URL. The presence of a large number of external PDF links suggests a link farm or SEO poisoning attempt 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.club/wix?keyword=columbia+pictures+font
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/c8d394_37158fa741f14da9b52cb0d7cdbb987f.pdf
    • https://static.usrfiles.com/ugd/5899d5_2174698d4b2347ebbd3272d81e2364f6.pdf
    • https://static.usrfiles.com/ugd/01e791_f6131fddcd1349dab0ca647a57d678bc.pdf
    • https://cdn.shopify.com/s/files/1/0434/3015/0296/files/vehicle_dynamics_ebook.pdf
    • https://cdn.shopify.com/s/files/1/0428/6241/1935/files/31020554160.pdf
    • https://cdn.shopify.com/s/files/1/0434/1065/3338/files/guzetesipijoge.pdf
    • https://cdn.shopify.com/s/files/1/0433/6680/9765/files/hodgdon_reloading_manual_2018.pdf
    • https://cdn.shopify.com/s/files/1/0428/0903/2863/files/zijir.pdf
    • https://cdn.shopify.com/s/files/1/0431/5562/0006/files/personal_development_lm.pdf
    • https://cdn.shopify.com/s/files/1/0436/6044/3813/files/suzixumedavufumenisotab.pdf
    • https://cdn.shopify.com/s/files/1/0444/3871/6583/files/mba_fundamentals_accounting_and_finance_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/1901/7124/files/73442485081.pdf
    • https://cdn.shopify.com/s/files/1/0438/4302/7106/files/telugu_reference_bible_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/8347/1771/files/84486010836.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008046.bin
f12da914c7d9aa78d37452a40db19131123b5621483497d670b9712eb21a0314		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8046 5208 bytes
font_01_sfnt_off000091db.bin
fcccb3b845643418365bdf65b1fca87f5c680ce44e13bd9f79f940de52ef6d15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91DB 10292 bytes
font_02_sfnt_off0000b514.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB514 4324 bytes

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