Malicious PDF — malware analysis report

Static analysis result for SHA-256 19fdb78ad567fea7…

MALICIOUS

PDF

57.2 KB Created: 2020-08-19 21:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a58cd427fe5210bdc1512264935afd8 SHA-1: e37920869e0158f40ec36d96fa306c0df3dd0cb9 SHA-256: 19fdb78ad567fea7aa70333a4249c6fa057e2e47a643ce84afa62a115a73ba6e
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify, and one critical link to a known malicious redirector. The document body, though heavily obfuscated, contains the URL for the malicious redirector, suggesting an attempt to trick users into visiting malicious sites under the guise of an affidavit form. The ML classifier also strongly indicated maliciousness.

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=affidavit+form+nsw+ncat
    • http://files.ywampotch.com/uploads/1/3/2/6/132681488/kajadinuvataxar.pdf
    • http://files.fishuntessentials.com/uploads/1/3/0/7/130738569/gifiduv.pdf
    • http://files.monikeri.com/uploads/1/3/2/7/132740978/1096578.pdf
    • https://cdn.shopify.com/s/files/1/0430/6976/7842/files/5629379348.pdf
    • https://cdn.shopify.com/s/files/1/0431/2373/6725/files/partnership_accounts_questions.pdf
    • https://cdn.shopify.com/s/files/1/0437/2781/4810/files/97820304638.pdf
    • https://cdn.shopify.com/s/files/1/0437/8496/2199/files/awg_size_chart.pdf
    • https://cdn.shopify.com/s/files/1/0429/7778/8057/files/xfdl_to_online_converter.pdf
    • https://cdn.shopify.com/s/files/1/0430/0341/2633/files/megulowituxukewes.pdf
    • https://cdn.shopify.com/s/files/1/0434/3103/5047/files/agency_theory_in_corporate_governance.pdf
    • https://cdn.shopify.com/s/files/1/0440/2656/0677/files/93284734619.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5797/files/brushless_dc_motor_specifications.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/70945418412.pdf
    • https://cdn.shopify.com/s/files/1/0433/1231/6584/files/hematologia_tipos_de_anemias.pdf
    • https://cdn.shopify.com/s/files/1/0434/8890/3325/files/45721993155.pdf
    • https://cdn.shopify.com/s/files/1/0433/2892/9960/files/android_phone_version_update.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_off0000a1dd.bin
242b5cbae51e8781342eae86cafdc2ca5af18112561f11a03e6ccf4d50d27f29
pdf-font-stream PDF embedded font (sfnt) at offset 0xA1DD 5276 bytes
font_01_sfnt_off0000b3c5.bin
63456a3e02980df0fe5912dc64f150cd19c2880509d26ebbc24b00e0c47afeab
pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C5 10628 bytes