Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d9f796015d526e1…

MALICIOUS

PDF

51.8 KB Created: 2020-08-22 01:16:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 399c0989a4528afc9596e59fd8a3c7db SHA-1: f5622d30ce2067fd7ff81ff103662b1d7eddac15 SHA-256: 9d9f796015d526e1a521143e11ee73691c7842b3b9b2bab426b0bd648fc9e2a4
152 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on Shopify, forming a link farm. One of these links redirects to a known malicious domain (ttraff.ru), indicating a potential SEO poisoning or traffic generation scheme. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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=game+cabal+online+2+indonesia
    • http://boneze.saalt.org.za/uploads/1/3/1/0/131070356/1386020.pdf
    • http://files.fishingtourismkefalonia.com/uploads/1/3/2/8/132814589/3222201.pdf
    • http://files.msfomo.com/uploads/1/3/0/7/130775982/1673933.pdf
    • http://dezopurar.quiltwithleslie.com/uploads/1/3/1/0/131070487/wobobugitifukadiweki.pdf
    • http://files.superiorwayoflife.com/uploads/1/3/1/3/131398560/7453346.pdf
    • https://cdn.shopify.com/s/files/1/0427/8163/8812/files/15899894884.pdf
    • https://cdn.shopify.com/s/files/1/0430/4686/3005/files/hernia_femoralis.pdf
    • https://cdn.shopify.com/s/files/1/0431/0096/2977/files/padofamubijad.pdf
    • https://cdn.shopify.com/s/files/1/0430/2451/5235/files/40630919418.pdf
    • https://cdn.shopify.com/s/files/1/0431/6938/2568/files/sadubagexebukadagumikope.pdf
    • https://cdn.shopify.com/s/files/1/0432/3885/0724/files/25624221550.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/miveguxuxububepevomozit.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8865/files/kokexosefav.pdf
    • https://cdn.shopify.com/s/files/1/0435/8235/7663/files/update_android_box_x96.pdf
    • https://cdn.shopify.com/s/files/1/0433/2729/1542/files/setuz.pdf
    • https://cdn.shopify.com/s/files/1/0439/0351/6824/files/acdsee_software_free_for_windows_xp.pdf
    • https://cdn.shopify.com/s/files/1/0434/1828/8277/files/sakute.pdf
    • https://cdn.shopify.com/s/files/1/0433/1814/9285/files/sipijirewamero.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_off0000733e.bin
4d808dbf17cdd1d3ce43ea74bbbbaa50dbb04ecc2f15e174e50519085982f3b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x733E 5000 bytes
font_01_sfnt_off0000841b.bin
f7a46580d808d28d722dd81a765feb6a25afaf80e7f25fcc201a3c8ee7f75d02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x841B 15840 bytes
font_02_sfnt_off0000b455.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB455 4324 bytes

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