Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf38b7b9f37d3d3b…

MALICIOUS

PDF

46.0 KB Created: 2020-07-25 01:58:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33c7167f8cc9f683bd38b07d544cb246 SHA-1: 7aa7792676c0c3043da128bd7625ef6fe3330730 SHA-256: bf38b7b9f37d3d3b780d7b3923172496ac99aea60ae02e3d5f7db668ed1d2099
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains a mass of external links, with one specifically pointing to a redirector URL that is known to host malicious content. The document body, though heavily obfuscated, appears to be a lure related to financial schedules. The ML classifier strongly indicates maliciousness, and the presence of numerous links suggests a link farm or redirection strategy to deliver a payload.

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=car+payment+amortization+schedule+spreadsheet
    • http://files.janobykennels.com/uploads/1/3/0/7/130775753/2a3d69.pdf
    • http://files.porterforcanton.com/uploads/1/3/1/4/131437680/6833568.pdf
    • http://files.yoga-gayatri.si/uploads/1/3/2/3/132303374/xusuxeka.pdf
    • http://files.cbefitllc.com/uploads/1/3/1/3/131379040/nuweratilixa.pdf
    • http://files.palatinereview.com/uploads/1/3/1/3/131398530/bizolawetufi-bamixizalur-gufut.pdf
    • https://cdn.shopify.com/s/files/1/0429/7592/0282/files/85507618395.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mowelikuzamutaj.pdf
    • https://cdn.shopify.com/s/files/1/0432/7007/8617/files/midud.pdf
    • https://cdn.shopify.com/s/files/1/0431/5008/2202/files/77532353794.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/59022585862.pdf
    • https://cdn.shopify.com/s/files/1/0429/2745/6419/files/mewedepagaponapezukemaw.pdf
    • https://cdn.shopify.com/s/files/1/0435/3504/0664/files/34804046326.pdf
    • https://cdn.shopify.com/s/files/1/0429/6704/0154/files/5271455672.pdf
    • https://cdn.shopify.com/s/files/1/0434/5685/6230/files/javiponiwamijededu.pdf
    • https://cdn.shopify.com/s/files/1/0433/4721/4486/files/43426556927.pdf
    • https://cdn.shopify.com/s/files/1/0429/8866/7034/files/68728334748.pdf
    • https://cdn.shopify.com/s/files/1/0429/6769/5509/files/xiziger.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_off00007473.bin
5463386c208ac4c5314229479af4ed3b6374f128ab78ca7be6f33f8413ead95d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7473 5372 bytes
font_01_sfnt_off00008696.bin
459af9785c3cf922d499ee7758ba82228c171a58f68bc02cdc24778e8963198d
pdf-font-stream PDF embedded font (sfnt) at offset 0x8696 10512 bytes