Malicious PDF — malware analysis report

Static analysis result for SHA-256 1359a675eb832b2b…

MALICIOUS

PDF

41.0 KB Created: 2020-08-24 01:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: baa7439bd2dc7a5e548cbc21b207de09 SHA-1: ee2e2b6567baeeedbab30de8f440568dfed20257 SHA-256: 1359a675eb832b2bf3711f0f30e1d0db5b1839db43a3560bf80ff12921f318cc
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. The presence of numerous external PDF links, many pointing to Shopify, suggests a link farm designed to obscure the malicious destination. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=episiotomy+repair+video
    • http://files.carperfamilyband.com/uploads/1/3/0/8/130813921/2a1cddff343e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/3096/8480/files/xiaomi_mi_box_android_tv_4k_review.pdf
    • https://cdn.shopify.com/s/files/1/0433/8837/1107/files/18055222498.pdf
    • https://cdn.shopify.com/s/files/1/0431/3799/0813/files/7th_grade_math_pretest.pdf
    • https://cdn.shopify.com/s/files/1/0428/4622/4551/files/46543103446.pdf
    • https://cdn.shopify.com/s/files/1/0430/3680/3233/files/15117128185.pdf
    • https://cdn.shopify.com/s/files/1/0428/6775/3116/files/54337084183.pdf
    • https://cdn.shopify.com/s/files/1/0434/0803/1893/files/13823494873.pdf
    • https://cdn.shopify.com/s/files/1/0434/6016/5797/files/deadmau5_minecraft_skin.pdf
    • https://cdn.shopify.com/s/files/1/0431/7868/8674/files/dobekosegifixadokikejixi.pdf
    • https://cdn.shopify.com/s/files/1/0433/1202/1657/files/61370767556.pdf
    • https://cdn.shopify.com/s/files/1/0438/8107/0747/files/rovufufusiwalinizaze.pdf
    • https://cdn.shopify.com/s/files/1/0431/3127/3370/files/convert_to_text_file.pdf
    • https://cdn.shopify.com/s/files/1/0430/8231/7975/files/3621613191.pdf
    • https://cdn.shopify.com/s/files/1/0438/1750/0834/files/piping_isometric_drawing_guide.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_off00006314.bin
2b3d08a9451f9cb7b6ad2b61b5c283f092eb8c6210080b81e0a7112d538ab9a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6314 5192 bytes
font_01_sfnt_off000074ab.bin
49058d5a1aa8f271a16b3c6705bc354a3489d5e9d2885358b6b45c588e9c860c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74AB 10060 bytes

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