Malicious PDF — malware analysis report

Static analysis result for SHA-256 e84a40374a0886d5…

MALICIOUS

PDF

44.3 KB Created: 2020-08-19 16:30:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7c23957c51e94872d7f224cceab2b91 SHA-1: aa319cf3123aec080665919eb9b1a437daf182d5 SHA-256: e84a40374a0886d5bd073df9e7b595e6594c193e96aa52a3fc93d27be7e19100
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one identified as a malicious redirector. The heuristic firings indicate a PDF link farm, suggesting the document's primary purpose is to distribute links, potentially leading to malicious sites or further payloads. No scripts were extracted, but the extensive link farm and the malicious redirector strongly suggest a phishing or content-luring attack vector.

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=analytical+geometry+pdf
    • http://files.fiddleheadsurbanforestschool.com/uploads/1/3/1/3/131380814/lilekal.pdf
    • http://roroba.nfbfishing.com/uploads/1/3/1/3/131398428/mixisimomoxemil.pdf
    • https://cdn.shopify.com/s/files/1/0444/6614/3399/files/chhota_bheem_race_game_hack.pdf
    • https://cdn.shopify.com/s/files/1/0443/8661/5462/files/chief_keef_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0430/9542/5191/files/mazilamirazamipurotuvux.pdf
    • https://cdn.shopify.com/s/files/1/0437/1687/0293/files/presentation_in_english_example.pdf
    • https://cdn.shopify.com/s/files/1/0432/1984/5284/files/12378397916.pdf
    • https://cdn.shopify.com/s/files/1/0428/2623/6071/files/vexelobezaf.pdf
    • https://cdn.shopify.com/s/files/1/0440/0264/0030/files/pafurinudo.pdf
    • https://cdn.shopify.com/s/files/1/0428/6126/5062/files/bagatepaniduruledomu.pdf
    • https://cdn.shopify.com/s/files/1/0433/7431/3621/files/kegodi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7901/6360/files/69396340286.pdf
    • https://cdn.shopify.com/s/files/1/0435/1574/0314/files/88425789420.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_off00006e6f.bin
19dac6d911916f5ea73e6f030c91c9449c9284b3330ba40ec8843626972b2c28
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E6F 5388 bytes
font_01_sfnt_off000080af.bin
e9cc2efb51e06464aa7eb285222b8f358dd6a9dd52c9e46a36b3cf66dc23bc68
pdf-font-stream PDF embedded font (sfnt) at offset 0x80AF 10516 bytes