Malicious PDF — malware analysis report

Static analysis result for SHA-256 71a978ff9bd3c354…

MALICIOUS

PDF

42.6 KB Created: 2020-09-01 02:07:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebaf7a4f4ced7aa1e066715005be55ad SHA-1: fdb43e127315d8e30d1f1a4c633b32302e6d16f0 SHA-256: 71a978ff9bd3c3540c749f2ae610d5b42a0185b65a32481c58b601315ffaca2a
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the same URL found in the heuristic, suggesting an attempt to trick users into clicking it. The presence of multiple PDF links, many pointing to benign files, indicates a link farm strategy, likely to obscure the malicious destination.

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.cc/wix?keyword=bendy+in+nightmare+run+mod+apk+obb
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/8ab72e_5a631c17e1614cf0826deed67bb88dee.pdf
    • https://static.usrfiles.com/ugd/b8c837_11f98c82272947d1bb58f9fcd440486f.pdf
    • https://static.usrfiles.com/ugd/b8c837_3f9da9d239c04b9490fcdb421235720b.pdf
    • https://cdn.shopify.com/s/files/1/0438/1127/4914/files/81231093937.pdf
    • https://cdn.shopify.com/s/files/1/0434/6553/9741/files/duvovijixidelixowedoxi.pdf
    • https://cdn.shopify.com/s/files/1/0463/3093/7506/files/87235601283.pdf
    • https://cdn.shopify.com/s/files/1/0431/9290/9987/files/ews_certificate_gujarat.pdf
    • https://cdn.shopify.com/s/files/1/0428/2790/7239/files/lewebamopowewepuwed.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tovaje.pdf
    • https://static.usrfiles.com/ugd/affaa6_7b6a10d6551b4b89a7510db0b81559a0.pdf
    • https://static.usrfiles.com/ugd/48f461_33120259a153473d82de1ddb64c9052c.pdf
    • https://static.usrfiles.com/ugd/b8c837_ed2e180409194f98bff96c534e57243b.pdf
    • https://static.usrfiles.com/ugd/8127dd_c77368311ed849e3bed6bb1e34121954.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_off0000677b.bin
4a6ce775829cd17e9722d7b47b99610d2b22d62ec86b2b9345cd2de2a6a63220
pdf-font-stream PDF embedded font (sfnt) at offset 0x677B 5520 bytes
font_01_sfnt_off00007a18.bin
8dcdbac2aa96e016882de8ffe9c6f90847d73987dd09809648a82c7f0ee4fb3f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A18 10588 bytes