Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cec0fa208fc6475…

MALICIOUS

PDF

47.5 KB Created: 2020-07-28 13:39:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 200eda540763c21aeabeb042a3f3cb6d SHA-1: 7e4fc0bb7e0fc2619e2eda1a890d453deab2cd08 SHA-256: 1cec0fa208fc6475f6728729672eab83d20ef6e9cf5738cf3b89d0715402199e
154 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK pointing to 'ttraff.com'. Another critical heuristic, PDF_SEO_LINK_FARM, indicates a large number of external links, with 'cdn.shopify.com/s/files/1/0437/6900/4190/files/fakaxi.pdf' being the first listed. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

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.com/pify?keyword=mammogram+normal+report
    • http://files.athelstonekindergym.org/uploads/1/3/1/3/131383467/08f0174048bc2b5.pdf
    • http://files.rhapsodyartbarn.com/uploads/1/3/0/8/130874298/3888397.pdf
    • http://files.johnreidpe.com/uploads/1/3/1/4/131437626/3447265.pdf
    • http://files.coldcreekdogtraining.com/uploads/1/3/1/0/131070733/fiwufe.pdf
    • https://cdn.shopify.com/s/files/1/0437/6900/4190/files/fakaxi.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5797/files/pamubatij.pdf
    • https://cdn.shopify.com/s/files/1/0429/3391/1705/files/32086643963.pdf
    • https://cdn.shopify.com/s/files/1/0434/3853/8904/files/47001081468.pdf
    • https://cdn.shopify.com/s/files/1/0432/0349/4043/files/6484717440.pdf
    • https://cdn.shopify.com/s/files/1/0433/0379/6894/files/35449090430.pdf
    • https://cdn.shopify.com/s/files/1/0432/2417/0664/files/64623772480.pdf
    • https://cdn.shopify.com/s/files/1/0432/3147/7922/files/beripowiloteke.pdf
    • https://cdn.shopify.com/s/files/1/0430/3205/1873/files/10603082361.pdf
    • https://cdn.shopify.com/s/files/1/0429/2821/0073/files/nerapusimobezaro.pdf
    • https://cdn.shopify.com/s/files/1/0429/9338/5633/files/nuliza.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/
    • https://cdn.shopify.com/s/files/1/04

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007e7f.bin
12016a6d1e63c20289ecfcee2f54bf5854fd32b6289e09c1bc85caaaff9e2a52
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E7F 4704 bytes
font_01_sfnt_off00008e61.bin
e14f46eb176ed901ea295252bc1566d61c98084cf6e424dd1382135b2cf0a614
pdf-font-stream PDF embedded font (sfnt) at offset 0x8E61 10156 bytes