Malicious PDF — malware analysis report

Static analysis result for SHA-256 7264e7bb2362f7a8…

MALICIOUS

PDF

44.7 KB Created: 2020-08-03 10:21:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 47af556d48093273efff17415dce962b SHA-1: a9692c605f480e3355752c89e13c7b97cd694497 SHA-256: 7264e7bb2362f7a833e57bcdbd8e35112362148df0d16aa97903b61385441633
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple critical heuristics for containing a malicious redirector link and a large number of external links, suggesting a link farm or spam campaign. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the embedded URLs and the nature of the heuristics point towards an attempt to lure users to malicious sites, likely as part of a phishing or spam distribution effort.

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=python+trim+string
    • http://files.twinklenelson.com/uploads/1/3/0/9/130969673/4261dd09c6f5.pdf
    • http://files.goldbergacademy.org/uploads/1/3/0/7/130739227/bemajasirixifiju.pdf
    • http://files.mainstchurchofchristonline.com/uploads/1/3/0/8/130874324/rojofajofase_giludokubera.pdf
    • http://files.michaelyadvish.com/uploads/1/3/1/3/131379183/gisevafozawat.pdf
    • http://files.southaustintkd.com/uploads/1/3/1/4/131453902/demosabowir_banubonez_tuzorod.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/1214/5830/files/pitabalaj.pdf
    • https://cdn.shopify.com/s/files/1/0436/3150/9664/files/73691837813.pdf
    • https://cdn.shopify.com/s/files/1/0428/5959/3894/files/86558794358.pdf
    • https://cdn.shopify.com/s/files/1/0429/5534/1977/files/laxuredes.pdf
    • https://cdn.shopify.com/s/files/1/0435/3346/7807/files/werifu.pdf
    • https://cdn.shopify.com/s/files/1/0430/5335/1066/files/30925988890.pdf
    • https://cdn.shopify.com/s/files/1/0437/6009/1287/files/rikoxapa.pdf
    • https://cdn.shopify.com/s/files/1/0432/3305/0779/files/13734449165.pdf
    • https://cdn.shopify.com/s/files/1/0431/2891/4074/files/22028995369.pdf
    • https://cdn.shopify.com/s/files/1/0439/2707/7032/files/63815439526.pdf
    • https://cdn.shopify.com/s/files/1/0430/8949/4177/files/28114613423.pdf
    • https://cdn.shopify.com/s/files/1/0433/7877/0076/files/zekuwew.pdf
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/73733153370.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_off00005d28.bin
0dba033e554f3346fdd175a06c96921539308651f808d81cd3566de744d5c4c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D28 4960 bytes
font_01_sfnt_off00006dec.bin
15124bb45212509b5654a171d25f838bee4953024bf8b0552a770dfd2ed6ceb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DEC 10044 bytes
font_02_sfnt_off0000906d.bin
1d4ebd634e9a4b1afc3ba2e660f7abdbad7ecfb3c20c2fb0daf688bec4f9a1d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x906D 16232 bytes

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