Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f14b282c4965f96…

MALICIOUS

PDF

98.7 KB Created: 2020-08-30 07:10:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 365978ecf86d52e3903d183eb8108a5b SHA-1: fd0f7a646da98c308b47bbac20c40a29c885318e SHA-256: 8f14b282c4965f96866a4e3d5618b7de2a8ed56a3ad26c17f4af8776fdec7372
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure at 'ttraff.com'. The document body, though heavily obfuscated, contains text that appears to be a title ('Gish handbook 3.5') and the URL 'https://ttraff.com/wix?keyword=gish+handbook+3.5', suggesting a lure to a malicious site. The ML classifier also strongly indicated maliciousness.

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/wix?keyword=gish+handbook+3.5
    • https://static.usrfiles.com/ugd/b8c837_828c7b6b1e374f26b03c6deba4942538.pdf
    • https://static.usrfiles.com/ugd/ade4e6_e210881847d44a2c873e5d296fa87aca.pdf
    • https://static.usrfiles.com/ugd/e33828_74bf8fcaa8234a9193a9555b7d3f6179.pdf
    • https://cdn.shopify.com/s/files/1/0430/5698/8317/files/breast_cancer_awareness_campaign.pdf
    • https://cdn.shopify.com/s/files/1/0427/8029/5334/files/82369991298.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/basugogigarerebid.pdf
    • https://cdn.shopify.com/s/files/1/0432/2669/3789/files/culpable_homicide_scotland_sentencing_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0432/9055/8620/files/gaxijekepovivakuri.pdf
    • https://static.usrfiles.com/ugd/ab922d_8a67d18f8b7943fc92b402fbee4b0d84.pdf
    • https://static.usrfiles.com/ugd/2ac701_81ac67e6ec2948bf84bcb06dfac8ea1b.pdf
    • https://static.usrfiles.com/ugd/cec570_ccc127502a9d48aeab8cffc8989f55ce.pdf
    • https://static.usrfiles.com/ugd/3649d2_2743f98533804f5fa0b2c69cd8a6f149.pdf
    • https://static.usrfiles.com/ugd/3ce946_0e06821875634bfb9ff5e7b2fe1c5cac.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_off000146f5.bin
c277e3b68dad95cb4b4c0e9adf3923b3510cfc9f9aa20ce00869ae4ccea8061e
pdf-font-stream PDF embedded font (sfnt) at offset 0x146F5 5340 bytes
font_01_sfnt_off0001591c.bin
e59fdf12d408839541cd000abeb48829d2cc5a05e88af9d17eeb11f5a7cb8d33
pdf-font-stream PDF embedded font (sfnt) at offset 0x1591C 10912 bytes