Malicious PDF — malware analysis report

Static analysis result for SHA-256 b89a0b64c73a73fe…

MALICIOUS

PDF

33.8 KB Created: 2020-08-31 04:32:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 177759febde25a0acf0f8a19e9e4960c SHA-1: cc3480d7d1efdf6c232216cf5fceaad72c6bf2dc SHA-256: b89a0b64c73a73fecfd73f04e25207ff497aafc4d57de3c87c2aacd246a519c5
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/wix?keyword=f1+accountant+in+business+study+text'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many hosted on cdn.shopify.com. The document body, though heavily obfuscated, contains the same redirector URL and a reference to 'F1 accountant in business study text', suggesting a lure to disguise the malicious intent. The ML classifier also strongly flagged this PDF as malicious.

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/wix?keyword=f1+accountant+in+business+study+text
    • https://cdn.shopify.com/s/files/1/0437/0654/8377/files/91655185446.pdf
    • https://cdn.shopify.com/s/files/1/0450/6081/7048/files/anandamayi_ma_italiano.pdf
    • https://cdn.shopify.com/s/files/1/0430/4830/4797/files/92357964705.pdf
    • https://cdn.shopify.com/s/files/1/0433/7877/0076/files/tamixamutinogoroso.pdf
    • https://cdn.shopify.com/s/files/1/0429/2273/7830/files/12078427401.pdf
    • https://cdn.shopify.com/s/files/1/0465/4917/2382/files/jupixixebijetesoxemazu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7403/5607/files/xotifasupakukamokavejujex.pdf
    • https://cdn.shopify.com/s/files/1/0431/6345/1560/files/tecumseh_carburetor.pdf
    • https://cdn.shopify.com/s/files/1/0428/5923/3443/files/adult_games_iphone.pdf
    • https://cdn.shopify.com/s/files/1/0435/8704/3496/files/renal_diabetic_diet_recipes.pdf
    • https://cdn.shopify.com/s/files/1/0461/4232/4889/files/chunari_chunari_video_song_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/4021/1097/files/beps_action_5_final_report.pdf
    • https://cdn.shopify.com/s/files/1/0440/6345/7432/files/8227386251.pdf
    • https://cdn.shopify.com/s/files/1/0432/0873/6928/files/jurnal_capacity_requirement_planning.pdf
    • https://static.usrfiles.com/ugd/98e298_c1808f216d034a028715b7f6ba870815.pdf
    • https://static.usrfiles.com/ugd/e42ee3_38be6972fe3c45e792dc99870fe5c2db.pdf
    • https://static.usrfiles.com/ugd/b8c837_2611dc6242dd45be8fba7aff5a1e0f95.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_off00004771.bin
58afd06418b81038943d78345d4dc0f6ce5aa5a61857b00e04ffcbea35982524		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4771 5124 bytes
font_01_sfnt_off000058f8.bin
d09cc485785f68ff8f2e5c6a8a1171f312345f498dbacc003cd45abd7348496c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58F8 9828 bytes

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