Malicious PDF — malware analysis report

Static analysis result for SHA-256 43797769588febf8…

MALICIOUS

PDF

56.6 KB Created: 2020-09-08 21:05:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6551f3b02dcb149ff613ccfb267e99e SHA-1: 42d0f9bad999ba53370bbf4788ea140f11c7a2ad SHA-256: 43797769588febf8c4c9e69d2df4aaeecbd31c28183b775421c43bee411abff9
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as 'Acer aspire one recovery software free'. This link points to 'ttraff.me', a known malicious redirector. The document also contains a large number of external links, many of which are hosted on Shopify, suggesting a link farm for SEO manipulation to distribute the malicious content. The ML classifier strongly indicated maliciousness.

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/pify?keyword=acer+aspire+one+recovery+software+free
    • https://static.usrfiles.com/ugd/50988c_6b815169301640de99401ae5aec42be9.pdf
    • https://static.usrfiles.com/ugd/0aab01_30194413f33b43759c15e5fd316d2f43.pdf
    • https://static.usrfiles.com/ugd/c7ef1a_44034e07f02f49b58fb4fe165ea9659c.pdf
    • https://cdn.shopify.com/s/files/1/0433/3505/7559/files/kuxupeluxijoto.pdf
    • https://cdn.shopify.com/s/files/1/0434/1297/9879/files/pamogevimanisewu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3459/0878/files/handboek_bouwbesluit.pdf
    • https://cdn.shopify.com/s/files/1/0431/7639/4901/files/pneumatic_hand_tools.pdf
    • https://cdn.shopify.com/s/files/1/0461/9422/9406/files/forklift_driver_license_template.pdf
    • https://cdn.shopify.com/s/files/1/0436/9108/1882/files/nh_ch_mc_sng.pdf
    • https://cdn.shopify.com/s/files/1/0432/2571/0756/files/visual_studio_2008_free_download_full_version.pdf
    • https://cdn.shopify.com/s/files/1/0435/3146/8951/files/58549145076.pdf
    • https://cdn.shopify.com/s/files/1/0427/6404/2396/files/riwemomexavukivelabetotu.pdf
    • https://static.usrfiles.com/ugd/0d002d_c897bfaae5ce4d4bb61e848d6242f95a.pdf
    • https://static.usrfiles.com/ugd/8acad3_11f5837e2ee44be8bccdf06f68da7ceb.pdf
    • https://static.usrfiles.com/ugd/a467d2_a0e769bb74f64019b53098d8fb32180b.pdf
    • https://static.usrfiles.com/ugd/f103bb_0a1ad591068e408ca1083838c8ef78b7.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_off00009aad.bin
f0ba1e985e72e972f34df750791a6ed19c858407a3960f9af453ae28298ebdcb
pdf-font-stream PDF embedded font (sfnt) at offset 0x9AAD 5220 bytes
font_01_sfnt_off0000aca1.bin
f4cca828569d8cb5b3c835bcf966d0a68a5dbfec4aa5c72b3567ff22a76d3d5b
pdf-font-stream PDF embedded font (sfnt) at offset 0xACA1 12936 bytes