Malicious PDF — malware analysis report

Static analysis result for SHA-256 843fa391b097a2c3…

MALICIOUS

PDF

32.6 KB Created: 2020-08-25 01:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d96889787c65fd56689b2aac3a512c9 SHA-1: 79c6e3e8c52ea01ce713f5800892cc2e6a7bced1 SHA-256: 843fa391b097a2c3b3f89165a04e410a1e099b204e66d34b845b0e081e060761
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with the primary link leading to a known malicious redirector. The document body, though partially corrupted, contains text that appears to be a lure for song downloads, likely to disguise the malicious intent. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is designed to redirect users to harmful infrastructure.

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=aararum+manasil+ninnorikkalum+song+free
    • http://files.paramountrec.com/uploads/1/3/0/7/130775827/wanuvawofi.pdf
    • http://penogipi.thepurestbeauty.com/uploads/1/3/1/4/131453284/1812180.pdf
    • http://files.prestonsburgchurch.org/uploads/1/3/0/7/130775561/2e643acf6410.pdf
    • http://vofetid.dollardsoccer.ca/uploads/1/3/2/7/132740353/3978241.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/9191/0038/files/fatupajoduwonuluvuraniw.pdf
    • https://cdn.shopify.com/s/files/1/0445/5170/0644/files/alternative_investment_funds_sebi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5096/6950/files/3356328010.pdf
    • https://cdn.shopify.com/s/files/1/0435/1423/3000/files/52778558162.pdf
    • https://cdn.shopify.com/s/files/1/0435/6934/8763/files/email_domains_list.pdf
    • https://cdn.shopify.com/s/files/1/0435/8491/3563/files/giwezipotago.pdf
    • https://cdn.shopify.com/s/files/1/0441/4029/8392/files/78523746225.pdf
    • https://cdn.shopify.com/s/files/1/0437/3279/5541/files/gamagodolududodube.pdf
    • https://cdn.shopify.com/s/files/1/0433/6274/6517/files/51386884395.pdf
    • https://cdn.shopify.com/s/files/1/0432/6716/2276/files/anabolic_steroid_list.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_off000044bb.bin
bba1fa654a41b2725ef22ec69d9c3bc11ed8eaa5148b01a78d2ee8e487ee7182
pdf-font-stream PDF embedded font (sfnt) at offset 0x44BB 5140 bytes
font_01_sfnt_off00005624.bin
85f73b801a690de9e2d56b2aa5282adcb44ca1412ce63407b1de3e5b5a7475f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x5624 9260 bytes