Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8a9f47997c1416b…

MALICIOUS

PDF

49.1 KB Created: 2020-08-01 18:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d469d1aba1a68948adaa72d0c676ee18 SHA-1: fa3c84e0fbb4cab8efc729abed064f08ba797de9 SHA-256: d8a9f47997c1416b66da0c249f7dfcd687dd12e8bd577be68a6d48be4e60a5bb
152 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to external resources, a technique often used for SEO poisoning or to distribute malware. One critical heuristic identified a link to a known malicious redirector, 'https://ttraff.cc/pify?keyword=modifiers+tinkers+construct'. The ML classifier also strongly indicated maliciousness. The document body itself is largely unreadable binary data, but it does contain the malicious redirector URL and numerous other PDF links, reinforcing the link farm attack pattern.

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/pify?keyword=modifiers+tinkers+construct
    • http://files.northwoodilluminations.com/uploads/1/3/1/8/131871433/2077969.pdf
    • http://files.confessionsofanunderachiever.com/uploads/1/3/1/6/131636655/7385644.pdf
    • http://files.vcstemposium.org/uploads/1/3/0/9/130969740/3682924.pdf
    • http://files.supershiftery.net/uploads/1/3/1/3/131379700/5ef4484d4.pdf
    • http://files.nirvanapilkington.com/uploads/1/3/1/0/131070420/74bf4.pdf
    • https://cdn.shopify.com/s/files/1/0430/6714/6397/files/kirabomirowe.pdf
    • https://cdn.shopify.com/s/files/1/0436/9688/1814/files/makuwog.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/12719442443.pdf
    • https://cdn.shopify.com/s/files/1/0434/7278/1478/files/zesosivimudodejenawaloki.pdf
    • https://cdn.shopify.com/s/files/1/0433/5645/5067/files/43414760205.pdf
    • https://cdn.shopify.com/s/files/1/0430/9801/3857/files/66890206302.pdf
    • https://cdn.shopify.com/s/files/1/0429/9672/7962/files/88267180238.pdf
    • https://cdn.shopify.com/s/files/1/0429/6772/8279/files/84349555828.pdf
    • https://cdn.shopify.com/s/files/1/0433/3882/5887/files/7108700277.pdf
    • https://cdn.shopify.com/s/files/1/0437/7047/8746/files/xunod.pdf
    • https://cdn.shopify.com/s/files/1/0429/3538/6265/files/73604248622.pdf
    • https://cdn.shopify.com/s/files/1/0430/3329/7058/files/49387487800.pdf
    • https://cdn.shopify.com/s/files/1/0434/8785/4749/files/50289152826.pdf
    • https://cdn.shopify.com/s/files/1/0433/6926/7354/files/95451263412.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_off00007611.bin
a11642c4a7d86280b31737238d34fdcceeb945a85e55b599951a5b9101ee6fea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7611 4724 bytes
font_01_sfnt_off0000863e.bin
2355bcafe3253770dc1ffeb18249155e9d7f430f26e8b3baa50ce231fbcf7e5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x863E 10292 bytes
font_02_sfnt_off0000a956.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA956 4324 bytes

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