Malicious PDF — malware analysis report

Static analysis result for SHA-256 d888cf4452a4493c…

MALICIOUS

PDF

45.1 KB Created: 2020-08-04 10:31:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb667f17eadc25f551fe4ecd921cbc06 SHA-1: 00ac562f0db8c3b32f87440a88267e9c12e17604 SHA-256: d888cf4452a4493cbad55d576a8695b63e5270ffc78958b80a6b17b6e421bd00
154 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a critical heuristic identifying it as a redirector link to known malicious infrastructure. It also contains a link farm pointing to numerous external PDFs, with the primary redirector URL being https://ttraff.com/pify?keyword=equidade+de+genero+pdf. The document body contains garbled text but includes the same URLs, suggesting a lure to entice users to click on the malicious link. No scripts were extracted, and the family is unknown.

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/pify?keyword=equidade+de+genero+pdf
    • http://files.annehuthartist.com/uploads/1/3/1/4/131413905/589715.pdf
    • http://files.historicinterpretations.org/uploads/1/3/1/4/131438616/9471349.pdf
    • http://dosopira.whipcityshields.com/uploads/1/3/1/6/131636855/7977272.pdf
    • https://cdn.shopify.com/s/files/1/0432/2122/1539/files/occupational_therapy_and_neurological_conditions.pdf
    • https://cdn.shopify.com/s/files/1/0438/0770/3201/files/92020049611.pdf
    • https://cdn.shopify.com/s/files/1/0434/3696/6055/files/45096429957.pdf
    • https://cdn.shopify.com/s/files/1/0435/3651/5224/files/9214623420.pdf
    • https://cdn.shopify.com/s/files/1/0432/2469/4942/files/fisipafidizitufutulanovu.pdf
    • https://cdn.shopify.com/s/files/1/0437/8152/1560/files/nojaxorigemajusaga.pdf
    • https://cdn.shopify.com/s/files/1/0428/8485/8022/files/waiting_for_godot_quotes.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7416/files/mikorumefonowi.pdf
    • https://cdn.shopify.com/s/files/1/0431/3477/9553/files/69622295300.pdf
    • https://cdn.shopify.com/s/files/1/0438/6127/8885/files/folirali.pdf
    • https://cdn.shopify.com/s/files/1/0427/4506/9724/files/62890695939.pdf
    • https://cdn.shopify.com/s/files/1/0430/4715/7911/files/17111983200.pdf
    • https://cdn.shopify.com/s/files/1/0428/8790/5446/files/mopomuvixojojuda.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_off00006f54.bin
2594024c38f9dfb41f44cc509a56c92f62bf75c9122ced84c2ab657dd3915564
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F54 5080 bytes
font_01_sfnt_off000080a4.bin
bc8b67e9daf047f7b45e5b60e4422a9d72a3551d92cf670716e0e94cabcd62de
pdf-font-stream PDF embedded font (sfnt) at offset 0x80A4 11768 bytes