Malicious PDF — malware analysis report

Static analysis result for SHA-256 350999ba2d81692e…

MALICIOUS

PDF

46.8 KB Created: 2020-08-06 14:49:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3224e34e9ebd8158c0005a8d60fc4cf7 SHA-1: 5de0279d07a45eff680622735a0c83a003a1e2f2 SHA-256: 350999ba2d81692edd0da2ef01422750643183acbd1020044ab83ca13b2ede79
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with heuristics indicating a link farm and a redirector to known malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the primary attack vector appears to be the malicious redirection and the sheer volume of links, likely intended to manipulate search engine results or lure users to malicious sites.

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/wb?keyword=minueto%20de%20bach%20pdf
    • http://files.newdaychildrenscenter.com/uploads/1/3/0/7/130776001/fegaretet_ruzimofaluvizuj.pdf
    • http://files.workwithelise.com/uploads/1/3/1/3/131380849/f265e.pdf
    • http://bojusiz.danaenaturalphotography.com/uploads/1/3/2/6/132681947/jorut.pdf
    • http://files.capitolhillhealingartscollective.com/uploads/1/3/2/8/132814848/433077.pdf
    • https://cdn.shopify.com/s/files/1/0432/2567/7982/files/nuvekuz.pdf
    • https://cdn.shopify.com/s/files/1/0431/8360/3873/files/guitar_rig_5_preset.pdf
    • https://cdn.shopify.com/s/files/1/0429/1405/4300/files/tutani.pdf
    • https://cdn.shopify.com/s/files/1/0428/9013/3663/files/fisiko.pdf
    • https://cdn.shopify.com/s/files/1/0437/0956/3045/files/civil_engineering_building_construction_report.pdf
    • https://cdn.shopify.com/s/files/1/0432/3350/9534/files/making_a_play_abbi_glines_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0432/4789/4692/files/enlace_covalente_no_polar.pdf
    • https://cdn.shopify.com/s/files/1/0433/5550/4795/files/24797935318.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/20011772627.pdf
    • https://cdn.shopify.com/s/files/1/0431/6151/8231/files/stormwater_collection_systems_design_handbook.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xutuxajaz.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_off0000770b.bin
73430c5fa31b4af3277bc3154faeb651190b93412e94007a5fb295c2c0bc09df
pdf-font-stream PDF embedded font (sfnt) at offset 0x770B 5080 bytes
font_01_sfnt_off00008860.bin
35b723d1c4620116db7d45333adc1eec3273b95f14d0177dd87bed1cb53e8281
pdf-font-stream PDF embedded font (sfnt) at offset 0x8860 11272 bytes