Malicious PDF — malware analysis report

Static analysis result for SHA-256 45bfbe97d4350888…

MALICIOUS

PDF

46.6 KB Created: 2020-08-14 05:41:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 139c40962a4c1f035f9647e3570b2b80 SHA-1: c00713dd3bcf87a806e9478f45fda5c26efa207c SHA-256: 45bfbe97d4350888e719cefcb8e1f6d6309efd3d62a7f6e0c18bd0d320a7c754
152 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Shopify domains, suggesting a link farm for SEO manipulation. One critical heuristic identified a link to a known malicious redirector, ttraff.cc. The document body, though heavily obfuscated, contains text related to 'grammar practice worksheets pdf' and the malicious URL, indicating a lure to a phishing or malware distribution site.

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=hesi+grammar+practice+worksheets+pdf
    • http://pexileze.clovellypublicpandc.com/uploads/1/3/2/6/132696021/juvowojuzise_vowabet_bovipizaxuzobuz_zekeded.pdf
    • http://files.rpdk9history.com/uploads/1/3/2/6/132681602/kipolitupirora.pdf
    • http://files.sexualwellnessinstitute.com/uploads/1/3/1/3/131383821/loxebotebare.pdf
    • https://cdn.shopify.com/s/files/1/0452/2305/1424/files/fortnite_dance_therapy_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0440/2987/0230/files/63914519805.pdf
    • https://cdn.shopify.com/s/files/1/0429/1110/5191/files/axis_and_allies_map.pdf
    • https://cdn.shopify.com/s/files/1/0437/5347/2151/files/laxufomojixupok.pdf
    • https://cdn.shopify.com/s/files/1/0438/3594/9218/files/bixapiguzoritijetiri.pdf
    • https://cdn.shopify.com/s/files/1/0429/9220/5978/files/64580028264.pdf
    • https://cdn.shopify.com/s/files/1/0437/7070/8125/files/146866880.pdf
    • https://cdn.shopify.com/s/files/1/0434/5580/7654/files/firekijugaxijuguxoge.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6965/files/sajujab.pdf
    • https://cdn.shopify.com/s/files/1/0437/1392/1189/files/meweboves.pdf
    • https://cdn.shopify.com/s/files/1/0429/6717/1223/files/jewellery_making_tutorials.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_off0000770a.bin
3333fe395ada5290b0bbb87ab36f905396f2bfa88311afa897ffcfa18a20bad0
pdf-font-stream PDF embedded font (sfnt) at offset 0x770A 5656 bytes
font_01_sfnt_off00008a2f.bin
d20ea065689c4748fd50c2f7e1cf217562ef011de2e6539357cfb1eb1b36ec68
pdf-font-stream PDF embedded font (sfnt) at offset 0x8A2F 10256 bytes