Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0ffb9c824a1400a…

MALICIOUS

PDF

130.4 KB Created: 2020-08-07 07:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39c31d8a605dbab03cc7dbb492211300 SHA-1: b2a8868094cb9b29bec724e4dbf25dd464f74002 SHA-256: b0ffb9c824a1400a4807db9ddf0b70ce945a49d0dd65044dfceb2ab4db0ce974
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF was flagged by a critical heuristic for linking to known malicious redirector infrastructure. Additionally, it contains a large number of external PDF links, characteristic of a link farm. The primary malicious URL identified is https://ttraff.cc/pify?keyword=criticism+of+utilitarianism+pdf, which is likely used to direct users to a phishing or malware-hosting site. The ML classifier also 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.cc/pify?keyword=criticism+of+utilitarianism+pdf
    • http://files.breakthroughtc.com/uploads/1/3/1/4/131412235/nafopesekelov.pdf
    • http://zabom.miriad-tech.com/uploads/1/3/1/4/131406717/5101392.pdf
    • http://files.loveburley.org/uploads/1/3/2/6/132681558/lunuwepebipebexaf.pdf
    • http://files.lauraavnaim.com/uploads/1/3/0/9/130969819/0ec2ee5.pdf
    • http://files.nourkassam.com/uploads/1/3/0/7/130739970/2101392.pdf
    • https://cdn.shopify.com/s/files/1/0434/4751/7341/files/27951414796.pdf
    • https://cdn.shopify.com/s/files/1/0428/3393/6547/files/effects_of_obesity_on_health.pdf
    • https://cdn.shopify.com/s/files/1/0433/4790/2622/files/vidowe.pdf
    • https://cdn.shopify.com/s/files/1/0434/3326/3253/files/gajadafiwadedijugebenuxe.pdf
    • https://cdn.shopify.com/s/files/1/0431/8117/9037/files/luduvuka.pdf
    • https://cdn.shopify.com/s/files/1/0430/0659/1127/files/acids_and_bases_class_11_notes.pdf
    • https://cdn.shopify.com/s/files/1/0430/9866/9220/files/boxenujisuloromapuk.pdf
    • https://cdn.shopify.com/s/files/1/0431/0115/9575/files/namakesowetenasoduluxidi.pdf
    • https://cdn.shopify.com/s/files/1/0432/7132/3808/files/caprice_carcassi.pdf
    • https://cdn.shopify.com/s/files/1/0439/0620/3803/files/analysis_and_design_of_algorithms_a_beginner_s_approach.pdf
    • https://cdn.shopify.com/s/files/1/0434/1802/6142/files/79143989949.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20659662050.pdf
    • https://cdn.shopify.com/s/files/1/0438/9850/3336/files/scrabble_word_list_download.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_off0001c519.bin
cbbbd1ba0be45c8814eb2be6940d0be257b987c31a2870d4ff8e8e3f375fc703		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C519 5208 bytes
font_01_sfnt_off0001d6b5.bin
d7c7536a178899fd7aab2b1a75a2bf693401d1e948cca12f784ac660793bc9c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D6B5 10872 bytes

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