Malicious PDF — malware analysis report

Static analysis result for SHA-256 321fc8cb6099fbdd…

MALICIOUS

PDF

42.8 KB Created: 2020-08-28 14:32:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef93afde133a4c5e5e113aff6f306805 SHA-1: 00e9bc79aacebf06cc8ae93e8fccb57f4fd2bfaa SHA-256: 321fc8cb6099fbdd85161cc40ae7ab2cf475a2be73fb89f8a362c91a9fab1bff
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=reconnaissance+travailleur+handicap%25C3%25A9+fonction+publique'. This URL is likely used to redirect the user to a malicious site. The document body, though partially corrupted, contains text related to 'Reconnaissance travailleur handicapé fonction publique', suggesting a lure. The presence of a large number of external PDF links, many hosted on Shopify, further indicates a link farm or redirection strategy.

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.cc/pify?keyword=reconnaissance+travailleur+handicap%25C3%25A9+fonction+publique
    • http://bubenag.devonbatemusic.com/uploads/1/3/0/7/130738993/sodomagolijine.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/70934180934.pdf
    • https://cdn.shopify.com/s/files/1/0431/9179/5875/files/33119388113.pdf
    • https://cdn.shopify.com/s/files/1/0427/7387/2807/files/double_bohr_effect.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/ielts_speaking_exam_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0430/9165/6855/files/fupun.pdf
    • https://cdn.shopify.com/s/files/1/0440/5601/9109/files/rejipetutoxisamosalifag.pdf
    • https://cdn.shopify.com/s/files/1/0433/9725/1235/files/xajifamoketenebenepak.pdf
    • https://cdn.shopify.com/s/files/1/0435/7767/1843/files/doginarufegedatosedemox.pdf
    • https://cdn.shopify.com/s/files/1/0437/1457/6537/files/feligater.pdf
    • https://cdn.shopify.com/s/files/1/0433/3250/1656/files/dikilopuwulekenurawixat.pdf
    • https://cdn.shopify.com/s/files/1/0432/8184/2341/files/29765066897.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_off000061e4.bin
aa8b7a158285cc26854acc5de7419ea017c0060fedc708fdd89b3d9ba378d768
pdf-font-stream PDF embedded font (sfnt) at offset 0x61E4 5716 bytes
font_01_sfnt_off00007501.bin
e97388fa601f110e3791e76f9cb26d2ca8f119cdbb14fefda23095e99d9c545f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7501 12492 bytes