Malicious PDF — malware analysis report

Static analysis result for SHA-256 3afdee35dd77289a…

MALICIOUS

PDF

42.2 KB Created: 2020-08-17 15:13:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc10da20fab305f8e0a55e1092846282 SHA-1: c1ee88f362d199ffbecb74cefc39db11d6127ee3 SHA-256: 3afdee35dd77289af3e3e04a2d847c7b7d859eaa2c183d2c273ff1f91bd32f27
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=binomische+formeln+r%25C3%25BCckw%25C3%25A4rts+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many hosted on Shopify. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs suggest a lure to download further malicious content or engage in phishing.

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=binomische+formeln+r%25C3%25BCckw%25C3%25A4rts+pdf
    • http://files.carolslifeafterretirement.com/uploads/1/3/1/6/131608037/vimexerewexeb.pdf
    • http://files.austindemaille.com/uploads/1/3/2/7/132740435/kofarefawegetine.pdf
    • http://lokolotel.farmhouse654.com/uploads/1/3/0/7/130775850/lapatekuwebazaxi.pdf
    • http://tekim.stpaulhinckleymn.org/uploads/1/3/2/6/132682883/9127383.pdf
    • https://cdn.shopify.com/s/files/1/0436/0116/6498/files/sudekibidapof.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75609531209.pdf
    • https://cdn.shopify.com/s/files/1/0433/5022/9160/files/60465966832.pdf
    • https://cdn.shopify.com/s/files/1/0431/8104/7965/files/sewepupobipuvoluj.pdf
    • https://cdn.shopify.com/s/files/1/0431/1482/3844/files/zapofugujivugozugegeteri.pdf
    • https://cdn.shopify.com/s/files/1/0432/7846/7238/files/xawibotitefixumokajisi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/24370467333.pdf
    • https://cdn.shopify.com/s/files/1/0434/3287/0044/files/flying_lotus_copypasta.pdf
    • https://cdn.shopify.com/s/files/1/0441/3744/7576/files/aimil_amyron_syrup_information.pdf
    • https://cdn.shopify.com/s/files/1/0433/7421/5331/files/7431907509.pdf
    • https://cdn.shopify.com/s/files/1/0433/4449/4750/files/45454108551.pdf
    • https://cdn.shopify.com/s/files/1/0435/3402/4855/files/tween_formal_dresses_near_me.pdf
    • https://cdn.shopify.com/s/files/1/0430/8205/5833/files/xanowelufokideve.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_off00006278.bin
067633b9865fb94a8b59cb4215937c10a65b5573cf150ab687991e74133e2502		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6278 5744 bytes
font_01_sfnt_off000075a7.bin
d67a65b21921fa64a86076d53be0943f892d5c591287d287c39e36bfa8bc965e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75A7 11064 bytes

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