Malicious PDF — malware analysis report

Static analysis result for SHA-256 4159f5b57d073917…

MALICIOUS

PDF

52.5 KB Created: 2020-08-02 11:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15fef0f7ee44e6f497675cee631073e1 SHA-1: 765e2f881f7d9655bbe7e7d3bc9e4e2444b76e5a SHA-256: 4159f5b57d07391782d696243312c317961cfca844c49564f20a59690b24f03a
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to direct users to a malicious redirector at `https://ttraff.com/pify?keyword=schizophrenia+nursing+diagnoses`. The ML classifier strongly indicated maliciousness, and the presence of numerous embedded links, many hosted on Shopify, suggests a campaign to distribute malicious content. No scripts were extracted, limiting the analysis of direct execution behavior.

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=schizophrenia+nursing+diagnoses
    • http://files.anglersadvantage.ca/uploads/1/3/2/8/132814476/5936485.pdf
    • http://files.considerhimoutreach.com/uploads/1/3/0/7/130775747/kokozonenunun.pdf
    • http://files.lapinhouseusa.com/uploads/1/3/1/4/131453543/3084374.pdf
    • https://cdn.shopify.com/s/files/1/0430/6976/7842/files/71612019396.pdf
    • https://cdn.shopify.com/s/files/1/0430/3575/4650/files/51483126580.pdf
    • https://cdn.shopify.com/s/files/1/0429/3056/9382/files/10959863422.pdf
    • https://cdn.shopify.com/s/files/1/0433/7437/9158/files/pekazabomakakoxaku.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/64831632673.pdf
    • https://cdn.shopify.com/s/files/1/0431/8121/1802/files/54419860825.pdf
    • https://cdn.shopify.com/s/files/1/0434/0006/9285/files/kojexutizoluranogagumage.pdf
    • https://cdn.shopify.com/s/files/1/0438/1776/2973/files/4444472949.pdf
    • https://cdn.shopify.com/s/files/1/0429/7680/5023/files/79515633710.pdf
    • https://cdn.shopify.com/s/files/1/0433/5829/0070/files/77860141913.pdf
    • https://cdn.shopify.com/s/files/1/0429/2821/0073/files/54335188455.pdf
    • https://cdn.shopify.com/s/files/1/0432/5530/0249/files/wowelobebidovigirakela.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/20570365479.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_off00008f9c.bin
d3ad5052f37ca5b7f0f7effb387d4a8e72221d4d8da137a76337b9ef954fa72b
pdf-font-stream PDF embedded font (sfnt) at offset 0x8F9C 5456 bytes
font_01_sfnt_off0000a229.bin
299c8b42bcb28fdbd0a8a9652e56567ce47740c41baf80a005485a18a9a9ff23
pdf-font-stream PDF embedded font (sfnt) at offset 0xA229 10416 bytes