Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f61ba9688d92629…

MALICIOUS

PDF

38.5 KB Created: 2020-08-29 14:58:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd85a6ee0ccee340801946ef00268e59 SHA-1: 7e0f5285bf014bae520c66747020a44a53397e8f SHA-256: 5f61ba9688d9262960fcffc153eff8502a8acc14ddb9e6fa3f1b1f87e22b0962
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a malicious domain, disguised as a Blackberry autoloader manual. The ML classifier strongly indicates maliciousness, and the presence of a link farm suggests an attempt to distribute malicious content or SEO spam. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive document.

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/wix?keyword=blackberry+sqc100-+1+autoloader
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_574478db8c164d8684529770df75ca34.pdf
    • https://static.usrfiles.com/ugd/b8c837_c4815c83b5ea43cca81076e6b930a981.pdf
    • https://static.usrfiles.com/ugd/b8c837_98c42a7bebad40b3bb10e7c6e3deba65.pdf
    • https://static.usrfiles.com/ugd/b8c837_be15e82486eb4077ada1821a06a4844a.pdf
    • https://static.usrfiles.com/ugd/b8c837_4fd4d3b790104b7cae4c1ac4d21cb031.pdf
    • https://static.usrfiles.com/ugd/b8c837_10dc3f92d74e4203883738d3d2ffd212.pdf
    • https://static.usrfiles.com/ugd/b8c837_a107a1d0827641bd97289a95c729bf0a.pdf
    • https://cdn.shopify.com/s/files/1/0441/3915/1512/files/hotpoint_smart_washing_machine_9kg_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/7011/8306/files/toyota_yaris_2010_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/4954/2047/files/34026288753.pdf
    • https://cdn.shopify.com/s/files/1/0440/5824/7320/files/42881780829.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bizisumexu.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_off00004f49.bin
5d550ad2258eeffec8c53dc76451af5ebcd68f8e1ba55394874964ba5a60754e
pdf-font-stream PDF embedded font (sfnt) at offset 0x4F49 5640 bytes
font_01_sfnt_off0000629e.bin
86d50f9291ffbe8a1aeee604870d387a206f8aee85c454127466e198728a4e33
pdf-font-stream PDF embedded font (sfnt) at offset 0x629E 13576 bytes