Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fa69735cce1392b…

MALICIOUS

PDF

40.7 KB Created: 2020-08-03 23:33:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a402e8aa64493c4ec2074f2db7c09356 SHA-1: 4981368c2d53a35941ce43a2861ebad5e9861771 SHA-256: 4fa69735cce1392b5a5774c267f30bac8acdd381023631b1fa6292a42a319322
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm designed to appear as a manual, but the primary link redirects to malicious infrastructure. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this, and the ML classifier strongly supports the malicious nature. The document body, though heavily obfuscated, contains the malicious URL, indicating a social engineering lure to drive traffic to a potentially harmful site.

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.com/pify?keyword=ppap+ford+manual+pdf
    • http://files.brpride.org/uploads/1/3/0/7/130775795/2630316.pdf
    • http://files.clbmg.com/uploads/1/3/2/8/132815807/5996800.pdf
    • http://files.ukyorthoresidency.com/uploads/1/3/1/3/131383544/fd3f1ac304.pdf
    • http://files.wowunderwaterphotography.com/uploads/1/3/0/8/130873997/5113402.pdf
    • http://files.guildedessentialtherapies.com/uploads/1/3/0/7/130738933/912c2c.pdf
    • https://cdn.shopify.com/s/files/1/0429/8476/7641/files/93602740249.pdf
    • https://cdn.shopify.com/s/files/1/0430/9411/4465/files/8735819547.pdf
    • https://cdn.shopify.com/s/files/1/0437/6559/6321/files/fetafavob.pdf
    • https://cdn.shopify.com/s/files/1/0430/4342/2359/files/nisopowawikofokexemawop.pdf
    • https://cdn.shopify.com/s/files/1/0432/0880/2468/files/74160135185.pdf
    • https://cdn.shopify.com/s/files/1/0433/4161/1173/files/muzutotewu.pdf
    • https://cdn.shopify.com/s/files/1/0428/5313/8591/files/refadipiniwivivigusolipuv.pdf
    • https://cdn.shopify.com/s/files/1/0430/6763/7922/files/lijafazajopinipal.pdf
    • https://cdn.shopify.com/s/files/1/0436/1030/8765/files/80091441047.pdf
    • https://cdn.shopify.com/s/files/1/0429/3358/4035/files/fe_review_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/8602/7677/files/17175854363.pdf
    • https://cdn.shopify.com/s/files/1/0429/0517/4183/files/zerife.pdf
    • https://cdn.shopify.com/s/files/1/0433/9400/7191/files/lexugonolaxagajoxifixuw.pdf
    • https://cdn.shopify.com/s/files/1/0430/8523/4338/files/zivirogoziwurazus.pdf
    • https://cdn.shopify.com/s/files/1/0440/3855/3765/files/4963427450.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_off0000643f.bin
0eecc425841ddbb6a29e65d8d7d695338f5fd83a73b68d801466cbfa706cc2a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x643F 5008 bytes
font_01_sfnt_off00007534.bin
0a58f3936c4012f8ecf62b199c97406ba6e96e976e055f60288adece240dbbb7
pdf-font-stream PDF embedded font (sfnt) at offset 0x7534 9568 bytes