Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7e6702aa694b7ef…

MALICIOUS

PDF

36.5 KB Created: 2020-09-01 01:41:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cbc4a72032971c2d149ca09236852c80 SHA-1: 86d768fc08e70a8b0ea3f99f08224c3fa4823719 SHA-256: d7e6702aa694b7ef788c5f4e71f257e877b2263bd51edada6fd06ff4df370617
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.cc/wix?keyword=unaffected+crossword+answer'. Additionally, it exhibits a PDF link farm heuristic, with numerous links to PDFs hosted on cdn.shopify.com, suggesting an attempt to obscure the malicious destination. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring the user to the malicious redirector.

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/wix?keyword=unaffected+crossword+answer
    • https://cdn.shopify.com/s/files/1/0448/7554/6791/files/christmas_carols_dickens.pdf
    • https://cdn.shopify.com/s/files/1/0429/3056/9382/files/53725993773.pdf
    • https://cdn.shopify.com/s/files/1/0427/9202/6271/files/classification_and_regression_trees_leo_breiman.pdf
    • https://cdn.shopify.com/s/files/1/0446/6386/5497/files/pajuzevituxufewesedawar.pdf
    • https://static.usrfiles.com/ugd/c8a981_95d66088ef4a465fa6bc177ba39a1ab0.pdf
    • https://static.usrfiles.com/ugd/b8c837_89a15ef2bbdf4668aa61d531536b533c.pdf
    • https://static.usrfiles.com/ugd/9b33c5_ca904fe193744feeb9652ddbc6b1163e.pdf
    • https://static.usrfiles.com/ugd/a43ec6_30cf796d457545acb2acf3396bc52924.pdf
    • https://static.usrfiles.com/ugd/b8c837_e32663d164b94940a19c6eeb3fa24506.pdf
    • https://cdn.shopify.com/s/files/1/0434/6501/5446/files/sotokosisejogotunadalaj.pdf
    • https://cdn.shopify.com/s/files/1/0440/9799/4904/files/2740972464.pdf
    • https://cdn.shopify.com/s/files/1/0462/3918/7104/files/tennessee_whiskey_sheet_music_free.pdf
    • https://cdn.shopify.com/s/files/1/0438/6213/0848/files/vademulunedizawuzivijo.pdf
    • https://cdn.shopify.com/s/files/1/0433/5101/5577/files/43293549133.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/67572949107.pdf
    • https://cdn.shopify.com/s/files/1/0430/7514/1783/files/ansi_c_programming_language_book.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gokibaleginasesomedusuj.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_off00005194.bin
da02ce3d8f34c6a037506d3db948f97b9a7d8b4c0de380084ea69fc4d96f0218		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5194 5064 bytes
font_01_sfnt_off000062f4.bin
62e919465d88086a070e8c837b7246375f24e124271a0cab61bb870033f8ab7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62F4 10008 bytes

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