Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a8e9123bd11b81e…

MALICIOUS

PDF

52.2 KB Created: 2020-08-07 00:25:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25fbd5b86633eab6c6e608bd52b84d2e SHA-1: 278f04fc3206b3c5854dc75e19333db41e22dfeb SHA-256: 3a8e9123bd11b81e15347237c23726a33de8e3b3af10e83bb526ec54330b91a7
154 Risk Score

Malware Insights

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

The PDF was flagged by a critical heuristic for containing a malicious redirector link and a large number of external links, suggesting a link farm for SEO poisoning or phishing. The ML classifier also strongly indicated maliciousness. The embedded URLs, particularly the one pointing to 'ttraff.cc', are likely used to redirect users to malicious sites. No scripts were extracted, limiting the analysis of direct execution behavior.

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=bible+stories+pdf
    • http://files.art-indeed.com/uploads/1/3/1/0/131070973/eab40181af.pdf
    • http://files.757careercoach.com/uploads/1/3/1/4/131483069/fetonomuwenebunod.pdf
    • http://files.applesandspindles.com/uploads/1/3/1/0/131069789/lasezuwafenezuv.pdf
    • http://bedis.cttntraumatraining.org/uploads/1/3/1/3/131381204/tojabelonejogu-luwiwinedu-tujowavozam.pdf
    • http://files.vote4georgechen.com/uploads/1/3/2/3/132303170/nexagagutedezuwesuf.pdf
    • https://cdn.shopify.com/s/files/1/0431/3874/4469/files/amharic_english_alphabet.pdf
    • https://cdn.shopify.com/s/files/1/0432/6660/5219/files/solutex.pdf
    • https://cdn.shopify.com/s/files/1/0431/2979/8818/files/lelololupizepe.pdf
    • https://cdn.shopify.com/s/files/1/0431/1393/9101/files/galunenuwakazema.pdf
    • https://cdn.shopify.com/s/files/1/0429/3758/1734/files/nugavunezamixolilepotu.pdf
    • https://cdn.shopify.com/s/files/1/0439/4637/7374/files/37535924789.pdf
    • https://cdn.shopify.com/s/files/1/0431/7049/6672/files/7036355012.pdf
    • https://cdn.shopify.com/s/files/1/0431/9523/6509/files/48351298108.pdf
    • https://cdn.shopify.com/s/files/1/0429/0645/2127/files/gobif.pdf
    • https://cdn.shopify.com/s/files/1/0434/1425/7815/files/97922480692.pdf
    • https://cdn.shopify.com/s/files/1/0437/9839/7085/files/mupadobonezalun.pdf
    • https://cdn.shopify.com/s/files/1/0431/2137/7434/files/nabiwoli.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_off00009047.bin
d220a328b7834921c6ad55e1e868efc3063f7e682394d5c163f8ea1ebc79a5af
pdf-font-stream PDF embedded font (sfnt) at offset 0x9047 5012 bytes
font_01_sfnt_off0000a15e.bin
cdca2c7671d8bd19dcd492faf754b0dba5ad24cf9062feee41166ff297e9cf6a
pdf-font-stream PDF embedded font (sfnt) at offset 0xA15E 10192 bytes