Malicious PDF — malware analysis report

Static analysis result for SHA-256 1839c557e521a8db…

MALICIOUS

PDF

101.8 KB Created: 2020-08-11 01:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 269e3d65e8169e4765dce73b03ef4c1a SHA-1: a97a1705e231e4f9022aa2efc9cede5a17e5b257 SHA-256: 1839c557e521a8db5cd2472b31521c591aeb3591e2c11bf07c29acd4378ab012
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to a link farm designed to manipulate search engine results. One prominent URL, 'https://ttraff.com/pify?keyword=biosynthesis+of+auxin+pdf', is flagged as malicious. The ML classifier also strongly indicates maliciousness. The document's structure and embedded links suggest an attempt to redirect users to malicious infrastructure, likely for phishing or malware distribution.

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.com/pify?keyword=biosynthesis+of+auxin+pdf
    • http://files.pharosjot.com/uploads/1/3/1/4/131453610/roradovixem_vemexisegida_farewilesojawip_tarowev.pdf
    • http://files.quicknezautoleasing.com/uploads/1/3/0/9/130969915/dawubal.pdf
    • http://purufu.georgeellis.co/uploads/1/3/1/3/131380505/famunidem.pdf
    • http://files.fleurieurecycling.com/uploads/1/3/2/7/132740670/9884728.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/8790/4422/files/30314909963.pdf
    • https://cdn.shopify.com/s/files/1/0433/3761/3461/files/72955186340.pdf
    • https://cdn.shopify.com/s/files/1/0428/2934/9030/files/65022544235.pdf
    • https://cdn.shopify.com/s/files/1/0429/3296/1443/files/9645812696.pdf
    • https://cdn.shopify.com/s/files/1/0428/7735/4143/files/jinuvelumezopuna.pdf
    • https://cdn.shopify.com/s/files/1/0435/3140/3423/files/computer_networking_tutorial_download.pdf
    • https://cdn.shopify.com/s/files/1/0427/7121/8588/files/vilesotebijabajanos.pdf
    • https://cdn.shopify.com/s/files/1/0435/3176/3864/files/kiruxigaluxowuxof.pdf
    • https://cdn.shopify.com/s/files/1/0433/4393/7690/files/nakop.pdf
    • https://cdn.shopify.com/s/files/1/0434/4302/8120/files/58830261495.pdf
    • https://cdn.shopify.com/s/files/1/0431/4788/6743/files/git_github._com_permission_denied_publickey.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013ea4.bin
e128cbcdf4c0b8b2ca62d34e7fa50b2a000182ac372c03787c83569db63012d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13EA4 5220 bytes
font_01_sfnt_off00015076.bin
9b4da3ab06dcff8abf05830c44c9be4c380264b696e3bfb722d93b6399c81b6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15076 10592 bytes
font_02_sfnt_off000174a8.bin
1a2b76eb92621148de57a48589384f2ed1ce1add53d2a8f9a0414c0ea737f4f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x174A8 16148 bytes

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