Malicious PDF — malware analysis report

Static analysis result for SHA-256 31dad486687056f8…

MALICIOUS

PDF

44.0 KB Created: 2020-08-12 05:02:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19c8ca6f499d80ff8a2929f15d10b6c0 SHA-1: 206daa6eb744b79a0789ef28e9346fd08a91451d SHA-256: 31dad486687056f8a4efbca0544e8c0dc29f0f528d0dfb84d3d7ed349ba3265c
152 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier and contains numerous embedded links. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=libro+el+magisterio+de+la+iglesia+pdf'. Another heuristic detected a link farm with 12 external PDF links, many hosted on shopify.com, suggesting an attempt to obscure the true destination or spread malicious content across multiple domains. The document body itself contains garbled text and a repeated malicious URL, further indicating a malicious intent to redirect users.

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.com/pify?keyword=libro+el+magisterio+de+la+iglesia+pdf
    • http://files.koldblooded.net/uploads/1/3/1/3/131383651/vevatejidesol_bevuvegapudewe.pdf
    • http://files.naturallyyoursbyisabel.com/uploads/1/3/1/1/131163635/vorij.pdf
    • http://tuxexa.codyjwoods.com/uploads/1/3/2/8/132814930/konebopopexuwidu.pdf
    • https://cdn.shopify.com/s/files/1/0428/5353/1807/files/xoxizarotavuzufisamunoxa.pdf
    • https://cdn.shopify.com/s/files/1/0439/2235/8427/files/wisujibadufirunudigebuja.pdf
    • https://cdn.shopify.com/s/files/1/0437/9246/6080/files/94922556213.pdf
    • https://cdn.shopify.com/s/files/1/0431/9969/2958/files/sefibozim.pdf
    • https://cdn.shopify.com/s/files/1/0438/6711/1584/files/30983072721.pdf
    • https://cdn.shopify.com/s/files/1/0437/6671/0433/files/ruramapikizejosen.pdf
    • https://cdn.shopify.com/s/files/1/0431/8678/2369/files/48236812167.pdf
    • https://cdn.shopify.com/s/files/1/0434/7949/8918/files/lolulazuvapupebadije.pdf
    • https://cdn.shopify.com/s/files/1/0433/1975/4907/files/21261010369.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_off00005da6.bin
a0413c9547ad5d5575db0a09b31ff4b875d2d2cffa7e495e1c5c89da41488d01
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DA6 5124 bytes
font_01_sfnt_off00006f08.bin
7352d22980e372b9ae8f87e14d2b8ada05bfab358f589eeea3df3650d3a57e19
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F08 11708 bytes
font_02_sfnt_off00009529.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x9529 4324 bytes