Malicious PDF — malware analysis report

Static analysis result for SHA-256 1584a5ee1f048685…

MALICIOUS

PDF

44.4 KB Created: 2020-08-30 11:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f314baefe1f816afcfcb229f4e2442b3 SHA-1: caa4da1989bfbd8a3e0b3142af48dc63ce97762a SHA-256: 1584a5ee1f0486854948b1d7423c36000a16024949afc5422ceceff02543b7b3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file flagged by multiple heuristics as malicious, including a redirector link and a link farm. The primary malicious URL identified is https://ttraff.ru/wix?keyword=dragon+age+2+friendship+guide, which is known to lead to malicious infrastructure. The document body contains obfuscated text and a reference to the malicious URL, suggesting an attempt to lure users into clicking the link. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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/wix?keyword=dragon+age+2+friendship+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0445/4429/5076/files/alice_cooper_poison_tab.pdf
    • https://cdn.shopify.com/s/files/1/0432/0627/9332/files/riminagezukofanukiluv.pdf
    • https://cdn.shopify.com/s/files/1/0430/0197/0837/files/futofaguparexidenenodadab.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jedajuzosefowi.pdf
    • https://cdn.shopify.com/s/files/1/0428/5507/1900/files/nissan_almera_tino_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0447/7770/1533/files/the_book_of_eli_bible.pdf
    • https://cdn.shopify.com/s/files/1/0434/0465/6797/files/gmat_integrated_reasoning_practice_test.pdf
    • https://static.usrfiles.com/ugd/b8c837_25a6bb1d7c204d19aa612d7f8767dc19.pdf
    • https://static.usrfiles.com/ugd/74e905_67fadefe35454956aff742da4fb73c32.pdf
    • https://static.usrfiles.com/ugd/f3ecbe_b96c16c49bf9407892e8ebed61b0a91a.pdf
    • https://static.usrfiles.com/ugd/3cb679_ec1c73d690344e7ab9a605dbc474b8b4.pdf
    • https://static.usrfiles.com/ugd/b8c837_0eb0e77a0ce34d7fbf99dfe246adae0b.pdf
    • https://static.usrfiles.com/ugd/74a852_1baba9c8e47741d89e987d2bbc27ae36.pdf
    • https://static.usrfiles.com/ugd/26938b_f48d10513b1d4ceeafaf0da85021f689.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f05.bin
fbe5199c3eefa0a1733bdcaefc01e727a750a1b7ce13ac01522394d1ef921568		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F05 5400 bytes
font_01_sfnt_off0000815e.bin
84228b00d619d88d459d5bce681431e24721dc6665b112d4ec64946d1d01883c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x815E 10272 bytes

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