Malicious PDF — malware analysis report

Static analysis result for SHA-256 3637565d45c76435…

MALICIOUS

PDF

40.6 KB Created: 2020-08-21 18:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d14101c358e91d97c8556315c414da66 SHA-1: 6f474e6f59be907b2c7ded8a4cf960c5f321a76a SHA-256: 3637565d45c764352cfc02ace661bbc00304aae74b444e375d13614b8242a58a
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.com) and then to other PDF files. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of a malicious redirector and a link farm designed to obscure the true destination. The document body, though heavily obfuscated, contains the URL that triggers the redirection.

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=bootstrap+card+template+example
    • http://wixefok.tuftsprintcopy.com/uploads/1/3/1/0/131070934/ae292a0084.pdf
    • http://files.blingyourgg.com/uploads/1/3/0/7/130776326/bopetijozitotak.pdf
    • https://cdn.shopify.com/s/files/1/0431/7020/1760/files/18961590671.pdf
    • https://cdn.shopify.com/s/files/1/0428/3406/7615/files/kupexu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5843/8056/files/34131295529.pdf
    • https://cdn.shopify.com/s/files/1/0431/7147/9713/files/undergraduate_commutative_algebra.pdf
    • https://cdn.shopify.com/s/files/1/0431/3609/0273/files/lowaniga.pdf
    • https://cdn.shopify.com/s/files/1/0429/6507/4086/files/fipujivad.pdf
    • https://cdn.shopify.com/s/files/1/0432/1266/9089/files/62035692193.pdf
    • https://cdn.shopify.com/s/files/1/0431/5725/8401/files/18066542219.pdf
    • https://cdn.shopify.com/s/files/1/0432/2381/0203/files/academic_performance_of_students_with_hearing_impairment.pdf
    • https://cdn.shopify.com/s/files/1/0433/4845/9675/files/opera_mini_browser_free_cnet.pdf
    • https://cdn.shopify.com/s/files/1/0447/2075/0745/files/naripolu.pdf
    • https://cdn.shopify.com/s/files/1/0438/4620/5602/files/rametitozisajoxofe.pdf
    • https://cdn.shopify.com/s/files/1/0437/1628/0475/files/vipebipozegetijeripuso.pdf
    • https://cdn.shopify.com/s/files/1/0437/6710/3645/files/subnet_mask_for_192._168._0._1.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_off00006344.bin
da1455133a38382faa2d2de9c9f68ce971378d58f305b0ce96c5cc847ad0b084
pdf-font-stream PDF embedded font (sfnt) at offset 0x6344 5336 bytes
font_01_sfnt_off00007554.bin
9f40ed6c481d338cad05a6f5b7353b2fa43065d9284773953720348bf94f61ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x7554 9392 bytes