Malicious PDF — malware analysis report

Static analysis result for SHA-256 89ac2b5439bdd1a5…

MALICIOUS

PDF

43.0 KB Created: 2020-09-02 08:10:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d5b4fd6de2636bb11f1b91f451e9887 SHA-1: b00d213b492ecf246e08c9da6f7043cd18b8a7f2 SHA-256: 89ac2b5439bdd1a52939c538925b3aa714c38fffe2c865ee6ada866e6b16c949
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a large number of external links, many of which point to redirector infrastructure. One such link, https://ttraff.com/wix?keyword=girl+background+hd+photo, is identified as a known malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting it is a primary lure. The presence of a link farm indicates an attempt to distribute malicious content or phish users.

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=girl+background+hd+photo
    • https://cdn.shopify.com/s/files/1/0427/9628/6119/files/anatomy_directional_terms_practice_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/1386/4604/files/65510529784.pdf
    • https://cdn.shopify.com/s/files/1/0428/9223/0823/files/quality_fertilizer_stardew.pdf
    • https://static.usrfiles.com/ugd/c75f60_88c470a8662d433cbf63420ef391d328.pdf
    • https://static.usrfiles.com/ugd/b8c837_f04ff70ac2c7404db8eb1046660cbc7d.pdf
    • https://static.usrfiles.com/ugd/b8c837_62ac221ab0b6499bbd06ebe1da90573b.pdf
    • https://static.usrfiles.com/ugd/12dc78_866b26b3873f452f96969066eae205eb.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/66689816557.pdf
    • https://cdn.shopify.com/s/files/1/0431/5712/7336/files/9276271384.pdf
    • https://cdn.shopify.com/s/files/1/0454/5331/2150/files/fakoraribevejadafuxe.pdf
    • https://cdn.shopify.com/s/files/1/0433/6618/7176/files/islamic_books_download_urdu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7278/2489/files/periodic_table_trends_worksheet_2_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/5308/7909/files/bullseye_lantern_osrs.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004842.bin
8ca5e537bddfca7ea1a7b2921518fe27153841095c2f88a0c450d17b593f8429
pdf-font-stream PDF embedded font (sfnt) at offset 0x4842 5392 bytes
font_01_sfnt_off00005a91.bin
c760ebed261c0b4cd3171568c76dfda8c6b7757072a9f141a8825c203b7261da
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A91 14616 bytes
font_02_sfnt_off0000881f.bin
4b52fd5da643d9c08cc0a86f773b2f024e3274f3f861dfcac100db1ef433cf06
pdf-font-stream PDF embedded font (sfnt) at offset 0x881F 16164 bytes