Malicious PDF — malware analysis report

Static analysis result for SHA-256 88730159a5857722…

MALICIOUS

PDF

40.6 KB Created: 2020-08-02 15:23:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c66d4bd4271149f3acb602153dfd173d SHA-1: 4061ff508998d1a328ade388e45ccec1b6834627 SHA-256: 88730159a58577229130750d230c2fbf8a2f53dcb12f12ac0b0d37c9b59d4fec
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One critical heuristic identified a link to a known malicious redirector, ttraff.com, suggesting a phishing or malicious content delivery attempt. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body is heavily obfuscated, but the sheer volume of external links and the presence of a malicious redirector are strong indicators of an attack pattern focused on link manipulation.

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=python+len+function
    • http://files.melodicfusion.org/uploads/1/3/1/4/131452959/dalizonelomas.pdf
    • http://files.milissweetstogo.com/uploads/1/3/0/7/130738971/7834426.pdf
    • http://files.mountolivet.org/uploads/1/3/1/6/131606056/dawakavifud.pdf
    • https://cdn.shopify.com/s/files/1/0432/3196/9438/files/27416473140.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/gosowizeropa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/larabobed.pdf
    • https://cdn.shopify.com/s/files/1/0431/7901/6349/files/thomas_calculus_12_edition.pdf
    • https://cdn.shopify.com/s/files/1/0438/4679/5424/files/foxit_editor_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0433/2657/0664/files/unity_button_onclick.pdf
    • https://cdn.shopify.com/s/files/1/0434/0963/7533/files/84530860238.pdf
    • https://cdn.shopify.com/s/files/1/0437/6693/9799/files/wadepoxunurapadewis.pdf
    • https://cdn.shopify.com/s/files/1/0437/3449/9493/files/busiliwowopu.pdf
    • https://cdn.shopify.com/s/files/1/0433/4639/5304/files/98901111741.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_off000061c6.bin
4bc1c17eff7b4b7959c250c04703e5cdbf7220c10036c496ab7ca87723c3dfa4
pdf-font-stream PDF embedded font (sfnt) at offset 0x61C6 4588 bytes
font_01_sfnt_off00007172.bin
69be16d0633af0908ec0d02323ee6550fb11d38f1fdd41a9f75064cffce82d2b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7172 10728 bytes