Malicious PDF — malware analysis report

Static analysis result for SHA-256 5efab52b3a73dc2d…

MALICIOUS

PDF

42.5 KB Created: 2020-08-10 02:26:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 90e5be1dc7cf0e05c37c020516080848 SHA-1: afca7682b492aa304e5f2d99becec7223263154e SHA-256: 5efab52b3a73dc2df526bc86ea639ce61c9f769361d8762b7592731e120f9478
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, including a redirector to `ttraff.com`, indicating an attempt to lead users to malicious sites. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the primary malicious URL and references to other PDF files, suggesting a link farm or redirection scheme.

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.com/pify?keyword=cb+radio+lingo+pdf
    • http://files.rachelcooperphotography.com/uploads/1/3/0/8/130813834/4207680.pdf
    • http://bexodapon.mimengraving.com/uploads/1/3/1/3/131380213/51ab6.pdf
    • http://files.myentouragemusic.com/uploads/1/3/2/8/132816036/4873819.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/1915/8183/files/pizojulusemoloxoba.pdf
    • https://cdn.shopify.com/s/files/1/0429/5314/6517/files/tizoruduletigatasu.pdf
    • https://cdn.shopify.com/s/files/1/0436/7794/1913/files/14867177532.pdf
    • https://cdn.shopify.com/s/files/1/0433/6893/9672/files/37876760489.pdf
    • https://cdn.shopify.com/s/files/1/0427/7737/8972/files/moluxedutidaju.pdf
    • https://cdn.shopify.com/s/files/1/0428/0818/0895/files/99628678892.pdf
    • https://cdn.shopify.com/s/files/1/0447/4611/3173/files/bahishti_zewar_book.pdf
    • https://cdn.shopify.com/s/files/1/0429/3401/0015/files/81295912327.pdf
    • https://cdn.shopify.com/s/files/1/0431/6702/3259/files/29285646109.pdf
    • https://cdn.shopify.com/s/files/1/0431/2743/9526/files/xogoturefegamedosurorinik.pdf
    • https://cdn.shopify.com/s/files/1/0427/8976/5279/files/sojenevixog.pdf
    • https://cdn.shopify.com/s/files/1/0434/4250/3832/files/derogudefugura.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_off00006977.bin
39cde57d292a296ba90fcb2e4d68cb229a0bc97e668d5549ce731646707b8825
pdf-font-stream PDF embedded font (sfnt) at offset 0x6977 5076 bytes
font_01_sfnt_off00007ac0.bin
27c18433beb226f1bcf05eca9390537ee44e0b303e121e28d585e601d2de23e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x7AC0 10088 bytes