Malicious PDF — malware analysis report

Static analysis result for SHA-256 b18a08c563da6aa1…

MALICIOUS

PDF

40.7 KB Created: 2020-08-14 19:53:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5804b5cda3170e4386b7c0e2228cc2e SHA-1: 2234a8a02a218d63204de01087d142bf0658d5f6 SHA-256: b18a08c563da6aa125d47906114a72efe49a36d80f723cb8ecae0396d6285310
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is designed to lure users to malicious content. The document body, though heavily obfuscated, contains text related to 'relation function domain and range worksheet answers' and the malicious URL, suggesting a lure to trick users into clicking the link. The presence of numerous other PDF links, many pointing to shopify.com, indicates a link farm strategy, likely to improve SEO for the malicious redirector.

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=relation+function+domain+and+range+worksheet+answers
    • http://kepug.mahonebayscarecrowfestival.com/uploads/1/3/1/3/131384635/1492013.pdf
    • http://kuwox.madsincinema.com/uploads/1/3/1/4/131438079/fomadamejosozup_wejanet.pdf
    • http://files.jennybirmelin.com/uploads/1/3/2/6/132680870/dawutupijaxejeb_lenajoxikabe_witen_gejinuvadig.pdf
    • https://cdn.shopify.com/s/files/1/0431/0774/5958/files/pegasus_sewing_machine_parts_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/0510/0707/files/87365831544.pdf
    • https://cdn.shopify.com/s/files/1/0430/9480/2589/files/84446531236.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0497/files/24930325705.pdf
    • https://cdn.shopify.com/s/files/1/0431/9005/9176/files/76347087449.pdf
    • https://cdn.shopify.com/s/files/1/0428/4809/2323/files/dijivabogapilagujagofikip.pdf
    • https://cdn.shopify.com/s/files/1/0435/9235/1907/files/bizatugedunebasozare.pdf
    • https://cdn.shopify.com/s/files/1/0430/4361/8969/files/lalapamavazipizipo.pdf
    • https://cdn.shopify.com/s/files/1/0427/4031/8375/files/nikilivanobinem.pdf
    • https://cdn.shopify.com/s/files/1/0428/3380/5471/files/tafunejinanororelujifised.pdf
    • https://cdn.shopify.com/s/files/1/0437/5894/4405/files/funegefatirudesarokozi.pdf
    • https://cdn.shopify.com/s/files/1/0434/0842/5116/files/cartoon_character_design.pdf
    • https://cdn.shopify.com/s/files/1/0448/0493/1746/files/85328973536.pdf
    • https://cdn.shopify.com/s/files/1/0430/8113/8343/files/tofubofezidefas.pdf
    • https://cdn.shopify.com/s/files/1/0431/6299/2795/files/29887444287.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/
    • https://cdn.shopify.com/s/files/1/0431/6299/2795/files/29887444287

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e17.bin
8a764f929104d27d06758c1afa865eaa291ba468bfee5bf09e6c9400ce6d7c5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E17 5600 bytes
font_01_sfnt_off00007110.bin
12a492b212a45ca397e808ba583f3a6262c00f9337e858781e5b038ea4cfe07a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7110 10544 bytes

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