Malicious PDF — malware analysis report

Static analysis result for SHA-256 56434434904162d9…

MALICIOUS

PDF

39.3 KB Created: 2020-08-31 07:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 237826aafd30070d75d8058bfed116e1 SHA-1: eeba27a307be5a5b08fd3de141aa10d197749ca5 SHA-256: 56434434904162d9007d42f178ce746aa8f4e13ab1865ff557229d06bfb86d8e
154 Risk Score

Malware Insights

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

The PDF was flagged as malicious by an ML classifier and contains a large number of external links, a technique often used for SEO poisoning or redirecting users to malicious sites. One of the embedded URLs, 'https://ttraff.link/wix?keyword=introduccion+al+diagnostico+por+imagen+smith+pdf', is identified as a known malicious redirector. The document body, though heavily obfuscated, contains this same URL, reinforcing its malicious intent.

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.link/wix?keyword=introduccion+al+diagnostico+por+imagen+smith+pdf
    • https://static.usrfiles.com/ugd/b8c837_4a8cfd4a21b14bce97a092a7442ac139.pdf
    • https://static.usrfiles.com/ugd/b8c837_d6c97b325978480dbf153dd2a6de8c26.pdf
    • https://static.usrfiles.com/ugd/bfbc46_48dad499ed9947d0a0f5ed64d58a92c4.pdf
    • https://static.usrfiles.com/ugd/2e4eb4_f18fd49c97ae4018bd576c2c31b6a71a.pdf
    • https://static.usrfiles.com/ugd/b8c837_933b41b389ec4ecaa962cabb6d69992f.pdf
    • https://static.usrfiles.com/ugd/b8c837_c2a0ed7352754b0397ec3d77f65b4e49.pdf
    • https://cdn.shopify.com/s/files/1/0435/3064/9749/files/socionics_infj_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8011835234.pdf
    • https://cdn.shopify.com/s/files/1/0428/1214/5823/files/jasekojekeza.pdf
    • https://cdn.shopify.com/s/files/1/0462/7742/7349/files/49092542420.pdf
    • https://cdn.shopify.com/s/files/1/0429/6504/1311/files/anne_of_green_gables_summary.pdf
    • https://cdn.shopify.com/s/files/1/0430/0849/1673/files/razekibedilovoretamibugo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5119/6315/files/anglo_norman_period.pdf
    • https://cdn.shopify.com/s/files/1/0435/2029/5064/files/rf_microelectronics_razavi.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_off000057a3.bin
6649232ee2f6dfeb124f1ac3f520d17dd27ec0e9df5c8617f17bf124142eefe2
pdf-font-stream PDF embedded font (sfnt) at offset 0x57A3 5504 bytes
font_01_sfnt_off00006a32.bin
a16353feb5058d13611f9dc3b12193e93b7640ac9ec25803dc150198bdad7786
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A32 11064 bytes