Malicious PDF — malware analysis report

Static analysis result for SHA-256 909b6efd55cf3e10…

MALICIOUS

PDF

36.6 KB Created: 2020-08-23 21:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9881060769e8e7ca630a5978195eafb5 SHA-1: 98460357bf66ff78732899ac5f813a58b1dde92a SHA-256: 909b6efd55cf3e101d4f105f4660680188cb6cd355bb2821ce99bdda19846a49
150 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=bluestacks++windows+10+32+bit'. This URL is presented as a search result for software, indicating a social engineering lure. The document also contains a PDF link farm heuristic, with the first URL being 'https://cdn.shopify.com/s/files/1/0434/1540/4702/files/paxebedokit.pdf'. The ML classifier strongly flags this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.cc/pify?keyword=bluestacks++windows+10+32+bit
    • http://files.incrediblydelicious.com/uploads/1/3/1/8/131856125/pulifo-nidefavufuzusif-sonobo.pdf
    • http://sovuwu.obriennewsservice.com/uploads/1/3/2/8/132814930/1764786.pdf
    • http://files.peterboroughtempleband.com/uploads/1/3/1/1/131164250/4242959.pdf
    • http://files.klehmannphotography.com/uploads/1/3/0/7/130776449/6148771.pdf
    • http://files.meganstrawn.com/uploads/1/3/2/7/132712251/d94fa55c9.pdf
    • https://cdn.shopify.com/s/files/1/0434/1540/4702/files/paxebedokit.pdf
    • https://cdn.shopify.com/s/files/1/0431/1161/2572/files/civic_engagement_theory.pdf
    • https://cdn.shopify.com/s/files/1/0431/4945/9605/files/chemical_equation_worksheet_types_of_reactions.pdf
    • https://cdn.shopify.com/s/files/1/0433/1687/1333/files/83277010420.pdf
    • https://cdn.shopify.com/s/files/1/0433/5999/4014/files/bloody_roar_2_android_iso.pdf
    • https://cdn.shopify.com/s/files/1/0439/3664/5275/files/59630426795.pdf
    • https://cdn.shopify.com/s/files/1/0428/8764/3303/files/15_minute_countdown.pdf
    • https://cdn.shopify.com/s/files/1/0433/0402/6280/files/lalevirarabawozukuxasomip.pdf
    • https://cdn.shopify.com/s/files/1/0435/7190/4673/files/39987792799.pdf
    • https://cdn.shopify.com/s/files/1/0429/6717/1223/files/cracking_the_toefl_ibt_2020.pdf
    • https://cdn.shopify.com/s/files/1/0438/4869/5958/files/55730965005.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_off0000511e.bin
4ae1cd45d7b8c00994ae46c048f8793a5ce8e5a00b4b015b28d0d923a8204cb4
pdf-font-stream PDF embedded font (sfnt) at offset 0x511E 5672 bytes
font_01_sfnt_off0000648c.bin
26860f9e2eb0a645873109cd6d51e07d2d57a36c1b50b10bb0577e2f28dd2244
pdf-font-stream PDF embedded font (sfnt) at offset 0x648C 9640 bytes