Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd278be8cbf46ed0…

MALICIOUS

PDF

46.3 KB Created: 2020-07-23 23:39:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c0193dfcb0a1671c7d706b900d4dab7 SHA-1: 6af30f01326ad4ad2cffc739af74ed533957e67a SHA-256: bd278be8cbf46ed055e8e81a9d04978557a1345b2c4d4e65c07fc6c83b227453
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, appears to be related to search terms, suggesting a lure for users to click on the malicious links. The ML classifier also strongly indicated maliciousness. The primary attack vector is the use of malicious links to redirect users to potentially harmful 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.ru/pify?keyword=post+office+interest+rate+2018+pdf
    • http://files.cebtechnology.net/uploads/1/3/1/3/131379594/dikexe.pdf
    • http://files.levihanes.com/uploads/1/3/1/3/131379540/1f1033d8c207.pdf
    • http://files.michaelcmarshall.com/uploads/1/3/1/6/131637137/4014108.pdf
    • https://cdn.shopify.com/s/files/1/0428/2525/3023/files/24911367705.pdf
    • https://cdn.shopify.com/s/files/1/0429/2666/9987/files/92728680543.pdf
    • https://cdn.shopify.com/s/files/1/0433/7870/4536/files/80883276740.pdf
    • https://cdn.shopify.com/s/files/1/0435/7026/6273/files/80846510885.pdf
    • https://cdn.shopify.com/s/files/1/0431/9870/9918/files/zarejakisavaganulowid.pdf
    • https://cdn.shopify.com/s/files/1/0440/0631/0046/files/mawekupepufi.pdf
    • https://cdn.shopify.com/s/files/1/0430/0098/7811/files/nolejaluvezogifexok.pdf
    • https://cdn.shopify.com/s/files/1/0429/6278/0311/files/37566975268.pdf
    • https://cdn.shopify.com/s/files/1/0427/5830/8006/files/faniwofudifitodum.pdf
    • https://cdn.shopify.com/s/files/1/0432/0880/2466/files/95609092655.pdf
    • https://cdn.shopify.com/s/files/1/0429/1916/6105/files/11282325975.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/1/0435/7026/6273/files/808

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007679.bin
d3991eead967ca7be32cb2b1f6b19514dcbe605f28dabd0b30b3006d2ffd7b71
pdf-font-stream PDF embedded font (sfnt) at offset 0x7679 5424 bytes
font_01_sfnt_off000088e6.bin
8be4e85b82eaad8fafc3cd17ccc5a8f4980e20ae65428d770a05251fbb88f7b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x88E6 10272 bytes