Malicious PDF — malware analysis report

Static analysis result for SHA-256 b55d0718f08a105c…

MALICIOUS

PDF

60.6 KB Created: 2020-08-02 03:27:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3442add36d704b01ef70618aceb333ba SHA-1: b41991f65d5e915544777038e45f257960f5b283 SHA-256: b55d0718f08a105cb2ddb16801d30cb3b3640d8de0ba3d4f41eabcda71f70cf3
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with a critical heuristic firing indicating a link farm pointing to a known malicious redirector. The primary malicious URL identified is https://ttraff.ru/pify?keyword=sublime+for+mac. While many other links point to benign Shopify domains, the presence of the redirector and the sheer volume of links suggest an attempt to obscure a malicious payload or phishing lure. No scripts were extracted, limiting further analysis of the payload delivery mechanism.

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/pify?keyword=sublime+for+mac
    • http://files.grinterfriends.com/uploads/1/3/2/6/132680813/cf746d.pdf
    • http://files.therusticacrellc.com/uploads/1/3/0/7/130775304/4846230.pdf
    • http://files.southphiladelphia-locksmith.com/uploads/1/3/2/6/132681740/rodawurivebovemivewo.pdf
    • http://files.drleifrosenberger.com/uploads/1/3/1/4/131454345/nitetelenav_xipekijobexotuz_pufila.pdf
    • https://cdn.shopify.com/s/files/1/0434/2749/6087/files/multivariable_calculus_stewart.pdf
    • https://cdn.shopify.com/s/files/1/0429/4000/6559/files/fotifomuwuwirenofu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0574/7108/files/66146868249.pdf
    • https://cdn.shopify.com/s/files/1/0434/0881/8333/files/27281491474.pdf
    • https://cdn.shopify.com/s/files/1/0432/0342/8510/files/remove_last_commit.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mufowotipopugisafe.pdf
    • https://cdn.shopify.com/s/files/1/0433/8191/5802/files/xiduniwowatuxi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7682/0890/files/18113857430.pdf
    • https://cdn.shopify.com/s/files/1/0430/3529/5905/files/ti_connectivity_cable.pdf
    • https://cdn.shopify.com/s/files/1/0428/2341/8019/files/jofazazibutegozikofiwaka.pdf
    • https://cdn.shopify.com/s/files/1/0430/9244/3303/files/tukeg.pdf
    • https://cdn.shopify.com/s/files/1/0434/3663/8360/files/sprint_web_texter_plus.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00008622.bin
149e4ab13b3fad6bd3b74b1a1d23e465cd7f1163e844bede3e66f0c0f25829f4		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8622 12412 bytes
font_00_sfnt_off000074f5.bin
11b9d86941fcb28414f4a2fb6b7d10438e163a6873dec78b3663ec0a3c7380a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74F5 5092 bytes
font_02_sfnt_off0000a952.bin
26f48a78dda7c87f09a8fce79c406accc79c3a656136a7ee01ab45a7cf3847b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA952 10968 bytes
font_03_sfnt_off0000cf02.bin
14549359d2aafbfa1ca372653fba7c564e4e60652088551b62d2e1a66803a328		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF02 16460 bytes

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