Malicious PDF — malware analysis report

Static analysis result for SHA-256 099ffcc5436cc7af…

MALICIOUS

PDF

40.4 KB Created: 2020-08-22 07:56:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e81fc8fce7bbedf0a992821172533c3 SHA-1: 881ea7741210e95b86a32fe27846c1c448411b8a SHA-256: 099ffcc5436cc7afec68cc1b44ee756b7c6b53a0947eca10d1d565c1288f382b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though partially corrupted, contains text related to 'interview writing format' and a URL that matches the redirector. The presence of a large number of external links, many pointing to Shopify, suggests a link farm designed to obscure malicious activity.

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/pify?keyword=interview+writing+format+ssc
    • http://files.longsilverconstruction.com/uploads/1/3/1/3/131381799/2627383.pdf
    • http://files.ninemillionbicycles.com/uploads/1/3/1/6/131637021/lotoverepitapeduz.pdf
    • http://files.ornamentalhenna.com/uploads/1/3/0/8/130815009/lisijiwofagusezuz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/5754/5365/files/65493403200.pdf
    • https://cdn.shopify.com/s/files/1/0429/4456/1319/files/bbc_iplayer_ipad_outside_uk.pdf
    • https://cdn.shopify.com/s/files/1/0436/1981/1490/files/kunenakidesajabajor.pdf
    • https://cdn.shopify.com/s/files/1/0432/7564/9180/files/emulator_android_untuk_linux_mint.pdf
    • https://cdn.shopify.com/s/files/1/0433/5930/5880/files/zenapodelalufufovoxebifa.pdf
    • https://cdn.shopify.com/s/files/1/0429/5743/9129/files/discord_rules_suggestions.pdf
    • https://cdn.shopify.com/s/files/1/0429/6625/3724/files/xizegeluvururoturaf.pdf
    • https://cdn.shopify.com/s/files/1/0437/6425/2823/files/ever_after_high_soundtrack.pdf
    • https://cdn.shopify.com/s/files/1/0437/2758/5430/files/foxarenizod.pdf
    • https://cdn.shopify.com/s/files/1/0429/3197/8403/files/old_navy_coupons_printable_2015.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/93515438816.pdf
    • https://cdn.shopify.com/s/files/1/0431/8494/7357/files/96346384979.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_off0000615a.bin
d75c91d19866d46a542f0d1f08179cfed4b7ee218d5825f82f66883cd2040fad
pdf-font-stream PDF embedded font (sfnt) at offset 0x615A 5256 bytes
font_01_sfnt_off00007335.bin
64469a63d86b961c1b3505fb499a2628e1d4db87cdbdc433ac874f363e560a83
pdf-font-stream PDF embedded font (sfnt) at offset 0x7335 9932 bytes