Malicious PDF — malware analysis report

Static analysis result for SHA-256 110318fbcc49f1c4…

MALICIOUS

PDF

52.8 KB Created: 2020-08-23 16:19:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f1a2b4e4d312aa0aefb16f23f30efd7 SHA-1: bb29dd671fa5251ef51f98ef349e6d8c384403fe SHA-256: 110318fbcc49f1c4991edc873d99ad6e33b39fe2de45e28c6c8b21267463166e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though partially corrupted, contains the same text as the malicious URL, suggesting a lure to trick users into clicking the malicious link. The ML classifier strongly indicates maliciousness, and the PDF structure is indicative of a link farm or redirection attack.

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=best+video+er+for+mac+online
    • http://bizetufip.msjpromo.com/uploads/1/3/0/7/130738799/lasuxetame-mawuwudotap-lorud-dedunukamafitu.pdf
    • http://files.aloenottingham.com/uploads/1/3/2/6/132696351/84004f905d118b1.pdf
    • http://files.thebodyshop82633.com/uploads/1/3/1/3/131381414/giwomeme_suzekika.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/8637/2246/files/76547859714.pdf
    • https://cdn.shopify.com/s/files/1/0430/4207/8877/files/basovidavazu.pdf
    • https://cdn.shopify.com/s/files/1/0428/1411/1903/files/34200288421.pdf
    • https://cdn.shopify.com/s/files/1/0433/3892/4181/files/rebozuwedotasekosuwozi.pdf
    • https://cdn.shopify.com/s/files/1/0438/3450/7426/files/xodij.pdf
    • https://cdn.shopify.com/s/files/1/0429/9807/1450/files/wobakivejudebadolese.pdf
    • https://cdn.shopify.com/s/files/1/0440/8279/0552/files/desmume_pokemon_roms.pdf
    • https://cdn.shopify.com/s/files/1/0436/3331/1904/files/25093377254.pdf
    • https://cdn.shopify.com/s/files/1/0440/5103/8358/files/trust_deed_format.pdf
    • https://cdn.shopify.com/s/files/1/0433/7709/8913/files/56185705643.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_off00008c65.bin
3a66931d93dfcb8d6c7163490a280d00ec94ed58ab5b9b6e1dc8fa766eb10836
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C65 5276 bytes
font_01_sfnt_off00009e41.bin
b3ff78b26884b041755b3ab8eea92f23a98122a76afef9e9d26e10b5bcb8591f
pdf-font-stream PDF embedded font (sfnt) at offset 0x9E41 12696 bytes