Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a0b5c68c82a941d…

MALICIOUS

PDF

40.7 KB Created: 2020-08-23 06:14:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef66cbdad732a4d16e855b0f84d5d529 SHA-1: 9e575c4d6ac723639039b68e47c989e7dfbe31b9 SHA-256: 7a0b5c68c82a941d76037f4c31432c891980323aac42490a9f2d93af163a4eb2
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service known to host malicious content. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious sites, 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=harvard+reference+style+guide+utas
    • http://files.coronagoldensandgoldendoodles.com/uploads/1/3/1/4/131406369/af978076e.pdf
    • http://nodufawow.stellarinternationalnetworks.com/uploads/1/3/1/3/131379070/2574676.pdf
    • http://files.costaballenamanagement.com/uploads/1/3/2/6/132681479/xegivol_wunigevuduwupa.pdf
    • http://geduxes.alicebeecherpoetry.org/uploads/1/3/1/6/131606490/wijixuxanabagarirufo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7995/8679/files/93497519234.pdf
    • https://cdn.shopify.com/s/files/1/0432/8646/2620/files/55478652904.pdf
    • https://cdn.shopify.com/s/files/1/0429/2254/1209/files/59231785467.pdf
    • https://cdn.shopify.com/s/files/1/0452/7328/4769/files/ingredients_in_cigarettes.pdf
    • https://cdn.shopify.com/s/files/1/0431/5034/4352/files/pig_latin_to_english.pdf
    • https://cdn.shopify.com/s/files/1/0437/1690/3080/files/political_psychology_noun.pdf
    • https://cdn.shopify.com/s/files/1/0437/6343/3621/files/39706009272.pdf
    • https://cdn.shopify.com/s/files/1/0434/8447/9641/files/60625911603.pdf
    • https://cdn.shopify.com/s/files/1/0432/7243/7910/files/lojuwitamizama.pdf
    • https://cdn.shopify.com/s/files/1/0451/3693/7125/files/vios_l2-_adventerprisek9-_m._ssa._high_iron_20180619._qcow2.pdf
    • https://cdn.shopify.com/s/files/1/0429/8299/8170/files/honda_300_fourtrax.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_off00006089.bin
e83f7e78b794deaf09ed5041980f7eb14e1f2f1089f62270dd224c89acd65cdd
pdf-font-stream PDF embedded font (sfnt) at offset 0x6089 5312 bytes
font_01_sfnt_off000072b4.bin
4dc6472367fbc3289508b76f859d8904628a628d8b112e6322c89ae3fea50c54
pdf-font-stream PDF embedded font (sfnt) at offset 0x72B4 10472 bytes