Malicious PDF — malware analysis report

Static analysis result for SHA-256 b27d2a1cbfb7b4cb…

MALICIOUS

PDF

42.8 KB Created: 2020-08-15 02:18:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11ae38f4c9f99fa68257cb1fd50c6b27 SHA-1: 6417fcf64a6f820d625726ff13bd47c9637267b4 SHA-256: b27d2a1cbfb7b4cbd84f0470486531abb5d030df8096708f6918b7ad8943e124
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though partially corrupted, contains text related to 'manualidades recicladas para el dia de muertos' and includes the primary malicious URL. The ML classifier strongly indicates maliciousness. The primary attack vector appears to be a link farm designed to redirect users to malicious sites.

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=manualidades+recicladas+para+el+dia+de+muertos
    • http://files.lonniejones.org/uploads/1/3/0/8/130874489/e735a95dc1.pdf
    • http://panifipo.ourriverview.com/uploads/1/3/1/3/131380213/4748918.pdf
    • http://zezedasa.jemdesignz.com/uploads/1/3/0/7/130739720/puxojaretudakat.pdf
    • http://files.lifeissweetdesigns.com/uploads/1/3/1/4/131408241/xobinamewerifut.pdf
    • https://cdn.shopify.com/s/files/1/0432/2312/2084/files/ropojusapejosepate.pdf
    • https://cdn.shopify.com/s/files/1/0429/2490/0515/files/guzisopojesadimu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1141/5962/files/3690878589.pdf
    • https://cdn.shopify.com/s/files/1/0437/7467/3050/files/12852862994.pdf
    • https://cdn.shopify.com/s/files/1/0429/0173/3542/files/jabejiverurubipabewexiduf.pdf
    • https://cdn.shopify.com/s/files/1/0440/9013/0584/files/weight_loss_exercise_plan_at_home.pdf
    • https://cdn.shopify.com/s/files/1/0435/1036/6362/files/68316682490.pdf
    • https://cdn.shopify.com/s/files/1/0437/9371/1261/files/retakebinipetata.pdf
    • https://cdn.shopify.com/s/files/1/0431/9005/9176/files/77578183131.pdf
    • https://cdn.shopify.com/s/files/1/0432/5595/5619/files/fojuforegolijebabixim.pdf
    • https://cdn.shopify.com/s/files/1/0433/8080/1701/files/10187850314.pdf
    • https://cdn.shopify.com/s/files/1/0441/0087/8488/files/sims_3_empty_worlds.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_off00006640.bin
b4858aed08d42fcf3ab39a2604462a02efc7a5c963bed766470cde4f30577dbf
pdf-font-stream PDF embedded font (sfnt) at offset 0x6640 5224 bytes
font_01_sfnt_off000077eb.bin
066f40f334af387345ad6660a4bec763efcba2e8f27e8c491d8f39104e38c694
pdf-font-stream PDF embedded font (sfnt) at offset 0x77EB 11180 bytes