Malicious PDF — malware analysis report

Static analysis result for SHA-256 19d62b67d2d4e02e…

MALICIOUS

PDF

46.8 KB Created: 2020-08-01 16:28:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18b9c7bede368c2f1d7862a33c1b5b52 SHA-1: d724edbf288a1b744d8c39672f3a067ffa266000 SHA-256: 19d62b67d2d4e02e291d92c090bd5c77d0dd045bb61a57fd35df3e1ef6c84d91
152 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier as malicious and contains a critical heuristic indicating a link to known malicious redirector infrastructure. Additionally, it features a large number of external PDF links, many hosted on Shopify, suggesting a link farm or SEO manipulation tactic. The primary malicious URL is https://ttraff.com/pify?keyword=asa+example+paper, which likely serves as a lure for a phishing or scam operation.

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=asa+example+paper
    • http://files.thesentimentalgift.com/uploads/1/3/1/4/131454549/sosadad_dunidaborij.pdf
    • http://files.tomitago.com/uploads/1/3/0/8/130873893/welifi.pdf
    • http://files.elknwillow.com/uploads/1/3/2/6/132695692/969dc13.pdf
    • https://cdn.shopify.com/s/files/1/0440/5864/0549/files/kavizutetumoludutonijot.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nebisineseboji.pdf
    • https://cdn.shopify.com/s/files/1/0440/5713/3221/files/tuwebujufejifidewakivexit.pdf
    • https://cdn.shopify.com/s/files/1/0437/4839/3112/files/gogoxogeritamuwope.pdf
    • https://cdn.shopify.com/s/files/1/0433/4472/4133/files/98365980960.pdf
    • https://cdn.shopify.com/s/files/1/0434/6534/3133/files/91914090302.pdf
    • https://cdn.shopify.com/s/files/1/0429/1425/0905/files/lilivatowam.pdf
    • https://cdn.shopify.com/s/files/1/0433/4705/0661/files/jufajusotakavot.pdf
    • https://cdn.shopify.com/s/files/1/0433/1097/3083/files/17498599330.pdf
    • https://cdn.shopify.com/s/files/1/0432/7260/1766/files/65735506133.pdf
    • https://cdn.shopify.com/s/files/1/0436/0939/1261/files/51751667749.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jibivugutujul.pdf
    • https://cdn.shopify.com/s/files/1/0434/8693/7250/files/pulonulo.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_off00007ad3.bin
7f5f95a5d1bb8675996b9317c0410b6dd910b82171a00d5f9a201429bda60aa6
pdf-font-stream PDF embedded font (sfnt) at offset 0x7AD3 5020 bytes
font_01_sfnt_off00008bd1.bin
50fb2fdcab49304378b6a464b61019dd274e7c72a3218a9b5f9209b2f6e68990
pdf-font-stream PDF embedded font (sfnt) at offset 0x8BD1 10208 bytes