Malicious PDF — malware analysis report

Static analysis result for SHA-256 62e15611bb798828…

MALICIOUS

PDF

37.6 KB Created: 2020-08-15 02:16:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1137530163cf83ba150e2511b07ce25d SHA-1: 7287958f859436644c2ab6dc7edb045ab780b7c5 SHA-256: 62e15611bb79882837d7509ba95dc1baae2ed7abdfa891a3385ac4fbccc54b2b
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a link farm designed to redirect users. One such link, 'https://ttraff.cc/pify?keyword=future+tense+worksheets+5th+grade', is identified as a malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The presence of embedded URLs and the link farm structure suggest an attempt to drive traffic 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.cc/pify?keyword=future+tense+worksheets+5th+grade
    • http://files.bcchildandyouthincareweek.com/uploads/1/3/1/4/131452997/gofirefex.pdf
    • http://files.kattiebees.com/uploads/1/3/0/7/130739251/tejug_zutebogisega_dogusu_redipo.pdf
    • http://files.muslimpraynplay.com/uploads/1/3/1/4/131437276/89f486d3a0.pdf
    • http://files.thbmed-rescue.co.uk/uploads/1/3/1/8/131871535/xemedepixasejidod.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/2655/3755/files/davorurotewoduw.pdf
    • https://cdn.shopify.com/s/files/1/0431/8819/1396/files/xoxunon.pdf
    • https://cdn.shopify.com/s/files/1/0430/6596/6754/files/pifawaxaralifugidutom.pdf
    • https://cdn.shopify.com/s/files/1/0431/5293/3021/files/37723019974.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rejumaxerufu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7285/5957/files/gabudunusukizulixi.pdf
    • https://cdn.shopify.com/s/files/1/0428/8957/6601/files/kuvibekalunasag.pdf
    • https://cdn.shopify.com/s/files/1/0433/6022/3387/files/counter_strike_1._6_free_macbook.pdf
    • https://cdn.shopify.com/s/files/1/0430/7727/1716/files/ramiwokiraja.pdf
    • https://cdn.shopify.com/s/files/1/0433/8237/4561/files/osu_aim_trainer.pdf
    • https://cdn.shopify.com/s/files/1/0430/7235/6514/files/sokiri.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005442.bin
61f91cf7a2975e5710a080bd84d7bd612b87ffda20b261c483939caad3a3a808
pdf-font-stream PDF embedded font (sfnt) at offset 0x5442 5288 bytes
font_01_sfnt_off00006654.bin
8e2145970c376d1cfba3a1c4c0af11ae29501a7c69502abc21a7f5c9772f6e64
pdf-font-stream PDF embedded font (sfnt) at offset 0x6654 10212 bytes