Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd4c363413b39eac…

MALICIOUS

PDF

40.8 KB Created: 2020-08-12 02:11:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a73328bf928b3d177ea23de59442be29 SHA-1: ed8bd122ab8d02576a4f4a0a4c462a7bfe410099 SHA-256: fd4c363413b39eac84b86acd4cd3cd7a7dc36b3bc4425c9bf4f271134b30baae
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/pify?keyword=aviation+english+teacher+s+book+pdf'. This indicates the document's primary purpose is to redirect users to malicious infrastructure. The presence of numerous other PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to obscure the malicious destination. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=aviation+english+teacher+s+book+pdf
    • http://nuzoxo.morningsuncpc.com/uploads/1/3/1/4/131406149/7523521.pdf
    • http://luroguf.medschoolpros.com/uploads/1/3/0/7/130775085/daxilugonagerokibiga.pdf
    • http://files.mytexanlife.com/uploads/1/3/1/4/131437567/nefalebemub-foviruzozofa-modaromu-dinifanozabajox.pdf
    • http://xupadamuf.jenmillersclass.org/uploads/1/3/1/3/131383483/xufatogewijimu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8752/8103/files/47032445956.pdf
    • https://cdn.shopify.com/s/files/1/0440/7253/4168/files/introduce_yourself_in_interview_for_freshers.pdf
    • https://cdn.shopify.com/s/files/1/0437/0723/6503/files/11067764476.pdf
    • https://cdn.shopify.com/s/files/1/0430/5528/4378/files/mivazazeguje.pdf
    • https://cdn.shopify.com/s/files/1/0432/9163/9968/files/java_basic_programs_with_explanation.pdf
    • https://cdn.shopify.com/s/files/1/0429/8683/2035/files/vumakamijolotatebewepe.pdf
    • https://cdn.shopify.com/s/files/1/0430/6989/8909/files/18709366390.pdf
    • https://cdn.shopify.com/s/files/1/0434/1052/2277/files/zaxapez.pdf
    • https://cdn.shopify.com/s/files/1/0430/4925/5061/files/naremawolupomorugunotifin.pdf
    • https://cdn.shopify.com/s/files/1/0434/7127/4146/files/29748987233.pdf
    • https://cdn.shopify.com/s/files/1/0427/9032/2335/files/78711877119.pdf
    • https://cdn.shopify.com/s/files/1/0433/9512/1319/files/62863099885.pdf
    • https://cdn.shopify.com/s/files/1/0429/4826/4089/files/edema_angioneurotico_tratamiento.pdf
    • https://cdn.shopify.com/s/files/1/0432/0375/6191/files/78915466815.pdf
    • https://cdn.shopify.com/s/files/1/0438/5921/4501/files/56947684696.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_off00006040.bin
a169657b4ecff6c4001b0eefdd52dc35f1cb2cd0d878b42873e0fc85dbed68cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x6040 5668 bytes
font_01_sfnt_off00007381.bin
cd7f7593e8ae3ab5d2061535fbffcf11a109ac0659113681b1d994d12248954a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7381 10096 bytes