Malicious PDF — malware analysis report

Static analysis result for SHA-256 a00f881cf80450d4…

MALICIOUS

PDF

45.4 KB Created: 2020-09-01 05:30:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07b9f345467b911701e29a53b40a06e0 SHA-1: 6024574f8fd221f88174ff77e9aa70b32feadaa5 SHA-256: a00f881cf80450d444ca8654ce53e034fede653012818f09013931a8d8f23694
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised with a keyword related to Facebook Messenger. The document also functions as a link farm, containing numerous external links, many hosted on Shopify, likely for SEO manipulation or to obscure the malicious redirector. The ML classifier strongly indicated maliciousness.

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/wix?keyword=facebook+messenger+video+call+settings+android
    • https://cdn.shopify.com/s/files/1/0430/0803/2922/files/sapepakori.pdf
    • https://cdn.shopify.com/s/files/1/0431/4352/8609/files/mufatafanikajasojixelifi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/80804151078.pdf
    • https://cdn.shopify.com/s/files/1/0430/8199/0295/files/41967181102.pdf
    • https://cdn.shopify.com/s/files/1/0437/0166/5960/files/aquaculture_project.pdf
    • https://cdn.shopify.com/s/files/1/0429/7519/9391/files/51346589664.pdf
    • https://cdn.shopify.com/s/files/1/0434/4391/2856/files/91074155614.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sivuduveserekolagaxabulux.pdf
    • https://cdn.shopify.com/s/files/1/0432/6516/3422/files/49264539797.pdf
    • https://cdn.shopify.com/s/files/1/0432/0428/0481/files/27095685027.pdf
    • https://cdn.shopify.com/s/files/1/0429/6107/6387/files/sejarah_amandemen.pdf
    • https://static.usrfiles.com/ugd/856cea_f994ee4fab614adf980c1b98e1fff623.pdf
    • https://static.usrfiles.com/ugd/b916f4_a48d6faf0bb142729851abfabb45373f.pdf
    • https://static.usrfiles.com/ugd/e5cbe5_70153d93384c45058b6dc1d6acab79e7.pdf
    • https://static.usrfiles.com/ugd/b8c837_9b6a671e68074d0092aa7839ba5754c4.pdf
    • https://static.usrfiles.com/ugd/e2f7e1_377c0bc5ec044f60a71bb18eaa41cf93.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006647.bin
1d08b1f9cf65b4079466f945fe32d0bf65d12e5b105eb192c26227d6e1e5afbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6647 5264 bytes
font_01_sfnt_off00007811.bin
1539323339053076ad01a29d39db3917539d80b51efba82c0ccd8dabfeb6cab5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7811 10076 bytes
font_02_sfnt_off00009a4b.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A4B 4324 bytes

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