Malicious PDF — malware analysis report

Static analysis result for SHA-256 e882043b2dd5b4af…

MALICIOUS

PDF

37.5 KB Created: 2020-08-06 20:18:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 105e8ced35f269a01436533471cc6e6b SHA-1: 872c76613a8de07946faf0a08b9b3b204845a0fc SHA-256: e882043b2dd5b4af074f91cb84a964770259872b21701c0311d93c66c545207b
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=active+and+passive+voice+quiz+for+grade+8+pdf`. This indicates the document's primary purpose is to lure users to a malicious site. Additionally, the PDF acts as a link farm, distributing a large number of external PDF links, with `https://cdn.shopify.com/s/files/1/0429/7680/5013/files/succession_planning_journal.pdf` being the first identified. The ML classifier also strongly flagged this PDF as malicious.

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=active+and+passive+voice+quiz+for+grade+8+pdf
    • http://files.krisellcan.com/uploads/1/3/0/8/130813736/gitowedepifidudesis.pdf
    • http://files.mountainmayhemfireworks.com/uploads/1/3/0/8/130814129/6407935.pdf
    • http://files.honitonforum.org/uploads/1/3/1/4/131437530/duboxupa_kujuzozojum_kalakom.pdf
    • http://files.linkhornparkpta.com/uploads/1/3/1/3/131398281/8121906.pdf
    • https://cdn.shopify.com/s/files/1/0429/7680/5013/files/succession_planning_journal.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/sejix.pdf
    • https://cdn.shopify.com/s/files/1/0431/1305/4357/files/tepevixunuvexesiwitolevev.pdf
    • https://cdn.shopify.com/s/files/1/0429/2454/0071/files/lamamulozirelutovedalixu.pdf
    • https://cdn.shopify.com/s/files/1/0435/4598/5179/files/field_training_manual.pdf
    • https://cdn.shopify.com/s/files/1/0438/0481/9613/files/gem_add_source.pdf
    • https://cdn.shopify.com/s/files/1/0430/9758/7861/files/38696808250.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/xobimijuforazuwokizumezib.pdf
    • https://cdn.shopify.com/s/files/1/0438/6911/0432/files/daxadazijelunijem.pdf
    • https://cdn.shopify.com/s/files/1/0429/7683/7785/files/puxaruwurusifuxexixozidem.pdf
    • https://cdn.shopify.com/s/files/1/0437/5989/4689/files/51277085253.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bepojarovizezeba.pdf
    • https://cdn.shopify.com/s/files/1/0433/6238/6079/files/wawotadesuvav.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_off000051a2.bin
fe83acbd9972ee94bc4c6fe32e869fc3aff6563bbce328d252dc08346789655c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51A2 5712 bytes
font_01_sfnt_off00006533.bin
46228b32cc61c97686d9b7339c11a5b1841928321b1682d0bc06e52b514771c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6533 10460 bytes

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