Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ba2d1671949e83f…

MALICIOUS

PDF

50.9 KB Created: 2020-07-29 11:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bdaef956322851d67b9499f60fc15534 SHA-1: 62c75c34dea2504430f75b4d8313497073d2a868 SHA-256: 6ba2d1671949e83fcd8f11e928f5beb41877e59185be167b8bee4e9c9076f5b0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a coordinated effort to manipulate search results or distribute malicious content. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the embedded links are the primary attack vector.

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.ru/pify?keyword=complementary+feeding+pdf
    • http://files.futurescapes21c.com/uploads/1/3/0/7/130739211/vukaza.pdf
    • http://files.louisescott-bushell.com/uploads/1/3/1/3/131397927/41f2d13db7bb.pdf
    • http://files.personalhibachichef.com/uploads/1/3/0/7/130775518/ef47c65ebfc36f1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/7195/5353/files/23696293728.pdf
    • https://cdn.shopify.com/s/files/1/0434/8110/4541/files/53431420049.pdf
    • https://cdn.shopify.com/s/files/1/0430/9581/8404/files/13879829525.pdf
    • https://cdn.shopify.com/s/files/1/0432/2790/6206/files/27657196734.pdf
    • https://cdn.shopify.com/s/files/1/0428/3046/3135/files/febugu.pdf
    • https://cdn.shopify.com/s/files/1/0428/4484/8295/files/42896046785.pdf
    • https://cdn.shopify.com/s/files/1/0433/2696/3865/files/fedepewipukoxotofifofot.pdf
    • https://cdn.shopify.com/s/files/1/0429/1778/9862/files/ledubozonizeserirozemi.pdf
    • https://cdn.shopify.com/s/files/1/0429/7513/3859/files/98583437202.pdf
    • https://cdn.shopify.com/s/files/1/0432/9806/2501/files/kepiz.pdf
    • https://cdn.shopify.com/s/files/1/0429/6255/0940/files/jifexifabatavajimol.pdf
    • https://cdn.shopify.com/s/files/1/0432/0994/9348/files/40586349854.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_off00008692.bin
a338a632d6b40b6606dbd0ee0454d756d56257365956a12cb848f5c97aeba25d
pdf-font-stream PDF embedded font (sfnt) at offset 0x8692 5096 bytes
font_01_sfnt_off000097d7.bin
6c8aaa219c64498171ab032689d741005bcdad841daa0315916696cc2fb241e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x97D7 12044 bytes