Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd283002c3f5da1c…

MALICIOUS

PDF

49.1 KB Created: 2020-07-28 07:40:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12d97bb1a91873c519f83c6e2ee306bb SHA-1: 45f725f682842ac7f94d9dda2740fb98bc8abcdc SHA-256: dd283002c3f5da1cc4afa8c4f081f0cc225c9dae16d658713676ac547fbd35aa
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, many pointing to Shopify domains, forming a link farm. One critical heuristic indicates a link to a known malicious redirector, ttraff.com, which is likely used to obscure the final malicious destination. The ML classifier also strongly flagged this PDF as malicious. The document body is heavily obfuscated and appears to be junk data, suggesting the primary malicious function is delivered via the embedded links.

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=pedigree+worksheet+hitchhiker%2527+s+thumb
    • http://files.pro-consolutions.com/uploads/1/3/1/4/131406535/9abb92c5c4.pdf
    • http://files.dilafoundation.org/uploads/1/3/1/3/131382583/kinipiveruran.pdf
    • http://files.swnfrd.com/uploads/1/3/0/8/130874680/muridibokajo-jupogasikexa-wogipogo-pafivi.pdf
    • http://files.osukappaphilambda.org/uploads/1/3/1/4/131437236/94326e32.pdf
    • http://files.harrylsymons.ca/uploads/1/3/0/8/130813988/2304436.pdf
    • http://files.osukappaphilambda.org/uplo
    • https://cdn.shopify.com/s/files/1/0437/8466/7287/files/melapitod.pdf
    • https://cdn.shopify.com/s/files/1/0435/2871/6439/files/81729138586.pdf
    • https://cdn.shopify.com/s/files/1/0432/8076/0990/files/ginidusilukenukepuzara.pdf
    • https://cdn.shopify.com/s/files/1/0431/0843/4081/files/rabuga.pdf
    • https://cdn.shopify.com/s/files/1/0433/0101/1614/files/ponevarulomabosusone.pdf
    • https://cdn.shopify.com/s/files/1/0429/4279/1839/files/70457215346.pdf
    • https://cdn.shopify.com/s/files/1/0430/0396/9689/files/98923693394.pdf
    • https://cdn.shopify.com/s/files/1/0434/4669/8146/files/27066037494.pdf
    • https://cdn.shopify.com/s/files/1/0429/1880/5657/files/2593516386.pdf
    • https://cdn.shopify.com/s/files/1/0434/7383/0048/files/disimekasolewesisa.pdf
    • https://cdn.shopify.com/s/files/1/0437/3640/0037/files/bonaboxet.pdf
    • https://cdn.shopify.com/s/files/1/0434/3182/1473/files/55680476255.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_off00007fae.bin
9d844e045fb9b56e4e6d296155bad842ba0d94ded748bab8dd394ef256e5ccb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FAE 5216 bytes
font_01_sfnt_off00009186.bin
a31bdabd62397e75ce60d4110ddabe6afb2b70e2fc45d5e35b69687f651a187d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9186 10976 bytes

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