Malicious PDF — malware analysis report

Static analysis result for SHA-256 efe0e18fdf2126ac…

MALICIOUS

PDF

36.3 KB Created: 2020-09-09 04:04:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 394a41fb4d938c0ef361fb30ad410b43 SHA-1: c81dd0a45667a2ebb702ffc99a56af2207b4b4a4 SHA-256: efe0e18fdf2126ac91da42b21a49144be8122d07caa931a2d47307cbe9b165c9
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which points to 'https://ttraff.me/wix?keyword=medela+bilibed+service+manual'. Additionally, the PDF exhibits characteristics of a link farm, embedding numerous external PDF links, with the primary one being 'https://cdn.shopify.com/s/files/1/0448/1312/3744/files/wezikotutowefuxexurirife.pdf'. The document body text, though partially corrupted, includes the same service manual lure and the malicious URL, reinforcing the phishing attempt.

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.me/wix?keyword=medela+bilibed+service+manual
    • https://cdn.shopify.com/s/files/1/0448/1312/3744/files/wezikotutowefuxexurirife.pdf
    • https://cdn.shopify.com/s/files/1/0461/8348/1507/files/electronic_music_genres_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/5872/5018/files/82075762746.pdf
    • https://cdn.shopify.com/s/files/1/0431/8432/4770/files/5572171283.pdf
    • https://cdn.shopify.com/s/files/1/0434/3264/0664/files/63729920782.pdf
    • https://cdn.shopify.com/s/files/1/0437/8532/2658/files/al_jamia_poopalam_notes.pdf
    • https://cdn.shopify.com/s/files/1/0436/2112/2208/files/fe_electrical_and_computer_practice_exam.pdf
    • https://cdn.shopify.com/s/files/1/0427/4126/8647/files/60968492370.pdf
    • https://cdn.shopify.com/s/files/1/0432/9196/7646/files/lord_shiva_wallpaper_for_mobile.pdf
    • https://cdn.shopify.com/s/files/1/0437/8407/7473/files/31120242268.pdf
    • https://cdn.shopify.com/s/files/1/0437/8941/8647/files/zipanigixitiritajusaw.pdf
    • https://cdn.shopify.com/s/files/1/0430/0144/6554/files/78049290361.pdf
    • https://static.usrfiles.com/ugd/b8c837_2e83c583517f4e54b0dcfc2fc68ba767.pdf
    • https://static.usrfiles.com/ugd/5c9621_8b4480abf3524247b8dddce794b432ab.pdf
    • https://static.usrfiles.com/ugd/02beb7_9fb47cb8fd864f37b7806298bab5d2ba.pdf
    • https://static.usrfiles.com/ugd/35e1ce_32f703d4628e4ac899a62fc46c4a27f3.pdf
    • https://static.usrfiles.com/ugd/4a6c57_aeb7619eb5034ae5882cc7ab8e1191be.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000505a.bin
966ec7a3ecbbb48a5c019e4e074a4ce7b98f991de28306e1de6dacff6184189f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x505A 5288 bytes
font_01_sfnt_off0000624d.bin
2f334db0d2371f1c4ea42bc1b6455007b83e1d046a669e530605cb19902af477		 pdf-font-stream PDF embedded font (sfnt) at offset 0x624D 9956 bytes

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