Malicious PDF — malware analysis report

Static analysis result for SHA-256 70819ae603897ad0…

MALICIOUS

PDF

42.5 KB Created: 2020-08-31 06:40:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 881382d90d5c1040406c27bd5e6bc67d SHA-1: a89edc8b6b51a6207a0caf28fae3703b9a08b6c3 SHA-256: 70819ae603897ad0e4bd224e1245926aa7a34ab1056d7f3a44ffabb7c67a1b28
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, but one critical link directs to a known malicious redirector. This suggests a link farm or SEO poisoning tactic designed to drive traffic to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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.ru/wix?keyword=turilli+lione+rhapsody+zero+gravity
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/9760/2713/files/zamuwevemaxano.pdf
    • https://cdn.shopify.com/s/files/1/0431/0283/0745/files/fluid_and_electrolytes_nursing_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/9476/8802/files/400099714.pdf
    • https://cdn.shopify.com/s/files/1/0436/1011/2163/files/addressing_barriers_to_learning_a_south_african_perspective.pdf
    • https://cdn.shopify.com/s/files/1/0427/9736/7452/files/62683438680.pdf
    • https://cdn.shopify.com/s/files/1/0433/7798/3653/files/97662819663.pdf
    • https://cdn.shopify.com/s/files/1/0434/4587/8950/files/bagazolebexaberur.pdf
    • https://cdn.shopify.com/s/files/1/0429/1044/9830/files/vagipote.pdf
    • https://static.usrfiles.com/ugd/3b47cb_36eee5864bc140009f764aa75f9b11f5.pdf
    • https://static.usrfiles.com/ugd/b8c837_17a860dedf444e51891f04637412621d.pdf
    • https://cdn.shopify.com/s/files/1/0437/3577/7445/files/ayyappan_songs_free_yesudas_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0437/9040/1687/files/jofonav.pdf
    • https://cdn.shopify.com/s/files/1/0435/4818/0634/files/165304988.pdf
    • https://cdn.shopify.com/s/files/1/0434/0364/0990/files/87908587873.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_off000066f1.bin
04c790964708575a6fb6ef17f55af7c4d97ad1e8f8c41027d7cc49c91a1dacb8
pdf-font-stream PDF embedded font (sfnt) at offset 0x66F1 5380 bytes
font_01_sfnt_off00007944.bin
e06e9616a0ebabe65e4acee871e9c214f5a33dfd1667d051ffd6384334cd710e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7944 10480 bytes