Malicious PDF — malware analysis report

Static analysis result for SHA-256 28bb338d34bb425c…

MALICIOUS

PDF

64.2 KB Created: 2020-09-13 07:02:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9511ee8d8ef306353350e325bf30c5ea SHA-1: bbc8f5272d1b4bc95da04dccc75317f717da3b46 SHA-256: 28bb338d34bb425cf1c3a0150ab833c5f70ed56e1455ecd11a0a99279db813bd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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.link/pify?keyword=sony+dream+machine+icf-cs15ipn+manual In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.fontrix.comhttp://www.nhncorp.comIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4977/0408/files/lafugerugiwilesir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9069/6597/files/romeo_and_juliet_unit_test_review_sheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4252/0739/files/bipamawafemi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2836/3939/files/34710045328.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1654/2632/files/lujudusimunisak.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/062c90_7119c202130c488589831451ec6e857d.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/d51d36_ec8a8e638c9d40e5853a8aee4eb28dd8.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/d31907_8d0a794b7a90432883af0ded59f51f3f.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/1c8c1e_36ab3c2efd9046e0aeac3a3154744386.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/ee6770_9ddb68386bfa4d5e8386e42b9c0e6703.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/e2c6c1_7e57ab659f864a99ab309e09ce12f340.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/086daf_0fdd5a9cd48e49db9c48a8fd27445b8a.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/5266/8830/files/18483382817.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1779/6775/files/sizam.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9797 5808 bytes
SHA-256: feddfcaf409cee73c35c6782ebadb535e2f029c9d0470822df2a5c2098643fb8
font_01_sfnt_off0000ab4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB4B 2584 bytes
SHA-256: b1046fdf10acfed2c706bab9dedf4be3e2b38f00f4f912ac31c91406e538fbf5
font_02_sfnt_off0000b644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB644 10232 bytes
SHA-256: 897af8b7777272250f534f48425996a32805d9eb0d9ecc9928d659ea5e87fa94
font_03_sfnt_off0000d944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD944 8156 bytes
SHA-256: f48c08f58cb5c1bae0a2ef930bf2d8be2564684e4d985b488bed4648fc547a50

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