Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4ba4271ac45afcf…

MALICIOUS

PDF

41.6 KB Created: 2020-08-10 07:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cdf691cfca7e332e963b68621c443290 SHA-1: c1abb3d4b867d881bc697f33c5c0a693707cde16 SHA-256: a4ba4271ac45afcf29e6feff4ce407dadee309f110e9f523e550c7e42056c477
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a malicious redirector link disguised as an 'advertising lesson plan pdf'. This link points to 'https://ttraff.com/pify?keyword=advertising+lesson+plan+pdf', which is known malicious infrastructure. The document also contains a large number of embedded links, many of which point to Shopify domains, likely as part of a link farm to improve SEO for malicious content. The ML classifier 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.com/pify?keyword=advertising+lesson+plan+pdf
    • http://files.theaustintexasteaparty.com/uploads/1/3/1/1/131164431/kilak.pdf
    • http://vewon.carolineparsonshypnotherapy.com/uploads/1/3/2/8/132814930/8871127.pdf
    • http://files.chorus-tube.com/uploads/1/3/0/7/130739146/a8bc304d6.pdf
    • https://cdn.shopify.com/s/files/1/0431/7744/3483/files/70118969983.pdf
    • https://cdn.shopify.com/s/files/1/0430/9018/2304/files/87232500540.pdf
    • https://cdn.shopify.com/s/files/1/0430/7750/1095/files/gixowetazijitazev.pdf
    • https://cdn.shopify.com/s/files/1/0449/5890/8584/files/cambridge_primary_science_stage_4_teacher_s_resource_book.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vatamukizulenekop.pdf
    • https://cdn.shopify.com/s/files/1/0429/9633/4753/files/89637935028.pdf
    • https://cdn.shopify.com/s/files/1/0430/4899/2930/files/aha_bls_for_healthcare_providers_student_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/0702/5060/files/fukevebove.pdf
    • https://cdn.shopify.com/s/files/1/0432/9711/2219/files/64804029880.pdf
    • https://cdn.shopify.com/s/files/1/0432/9229/5332/files/ferixasug.pdf
    • https://cdn.shopify.com/s/files/1/0431/0315/8433/files/active_directory_windows_server_2020_tutorial.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_off000063f5.bin
48c44fd5ee750f7e9288cc37541f87a1ebf5cba6938eb97315765cc11835ed0e
pdf-font-stream PDF embedded font (sfnt) at offset 0x63F5 5256 bytes
font_01_sfnt_off000075ed.bin
a08b15db546b0c7aa27d086e57d097ed1a0ff6b36a739f408b140f000b8946ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x75ED 10544 bytes