Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f2c12a3d41cb8eb…

MALICIOUS

PDF

43.1 KB Created: 2020-08-25 07:15:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1163d03c69a90cc3bb81d7f646e12faf SHA-1: cee5dc9be78f9db20c15b58ea443362ea434f631 SHA-256: 2f2c12a3d41cb8ebf2ab83497af38acb7762368ddf9d5a37bce5ce3d5b8aff34
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to `https://ttraff.cc/pify?keyword=olx+pakistan+apk+old+version`. This URL is designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, also contains this URL and numerous other links, many hosted on `cdn.shopify.com`, which is flagged as a link farm. The ML classifier also strongly indicated maliciousness.

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=olx+pakistan+apk+old+version
    • http://files.anndyer.org/uploads/1/3/1/4/131438471/0112854273fd4.pdf
    • http://files.oriskanymuseum.com/uploads/1/3/1/4/131453194/dd2e96fb5d7.pdf
    • http://fulaliw.northsidecolumbia.org/uploads/1/3/2/7/132712615/c5eca.pdf
    • https://cdn.shopify.com/s/files/1/0428/4032/6300/files/62319658969.pdf
    • https://cdn.shopify.com/s/files/1/0428/9455/7347/files/32535839529.pdf
    • https://cdn.shopify.com/s/files/1/0435/1816/5146/files/mla_referencing_style_examples.pdf
    • https://cdn.shopify.com/s/files/1/0433/2797/9678/files/skyrim_porn_mod.pdf
    • https://cdn.shopify.com/s/files/1/0445/3515/2804/files/apostrophe_s_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0459/9824/4007/files/getusujoselosupegezu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3747/4466/files/15936653970.pdf
    • https://cdn.shopify.com/s/files/1/0438/3657/1805/files/business_agreement_letter_sample.pdf
    • https://cdn.shopify.com/s/files/1/0432/5471/0427/files/verb_to_be_affirmative_negative_and_interrogative_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0449/8151/8494/files/oli_concealed_cistern_installation_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/3817/8470/files/photoshop_liquify_tool.pdf
    • https://cdn.shopify.com/s/files/1/0437/9679/1456/files/54781419326.pdf
    • https://cdn.shopify.com/s/files/1/0433/4456/0281/files/16427743216.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_off00006a5f.bin
2fa4ce14be20b9df57c2dedece6b0b98e5234aceb000d1b7f855f9e3bf9ca4d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A5F 5172 bytes
font_01_sfnt_off00007c07.bin
bd41db0ffdb408b7c34d73bcb53f491660cdb4e266e13f7c388180e50c836967		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C07 10476 bytes

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