Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba2657c33dedef1f…

MALICIOUS

PDF

45.0 KB Created: 2020-08-09 20:03:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6dce0261c33f2422e76b1a6986131dd SHA-1: a1b485009b6dd6cdd61f7d2ec3fa09ae9948aacb SHA-256: ba2657c33dedef1f976777536c43b72cc4006153b2c82de583635d74430a1119
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to external PDF files hosted on various domains. One critical heuristic identified a link to known malicious redirector infrastructure (ttraff.com), and another flagged a large external PDF link farm. The ML classifier strongly indicated maliciousness. While no scripts were extracted, the sheer volume of links and the presence of a redirector suggest a campaign focused on SEO manipulation or driving traffic to malicious sites.

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=brayton+cycle+with+regeneration+pdf
    • http://files.indiacanchange.org/uploads/1/3/0/9/130969306/7753453.pdf
    • http://vunepa.peterandpaulapixie.com/uploads/1/3/0/7/130738524/320114fc1.pdf
    • http://vexitora.hollieshandmadesoaps.com/uploads/1/3/2/7/132740435/mokajuxexamol.pdf
    • http://zofaj.killingfieldsterrain.com/uploads/1/3/0/7/130775350/neguras_vinajaneper_jobox.pdf
    • http://files.formulastudentusa.com/uploads/1/3/2/6/132695356/bd71239f0e3dd.pdf
    • https://cdn.shopify.com/s/files/1/0427/4189/1238/files/empire_season_1_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0433/9315/5235/files/609876396.pdf
    • https://cdn.shopify.com/s/files/1/0435/2252/3288/files/jugakanopuvugas.pdf
    • https://cdn.shopify.com/s/files/1/0430/0665/6666/files/83496385174.pdf
    • https://cdn.shopify.com/s/files/1/0441/2529/0648/files/pdf_to_word_program_full.pdf
    • https://cdn.shopify.com/s/files/1/0428/8577/5519/files/sofidoxasosesetovajup.pdf
    • https://cdn.shopify.com/s/files/1/0433/0792/5664/files/vosedosujef.pdf
    • https://cdn.shopify.com/s/files/1/0427/8226/1415/files/setuxemoganelotupugapuze.pdf
    • https://cdn.shopify.com/s/files/1/0438/3975/0294/files/96854171504.pdf
    • https://cdn.shopify.com/s/files/1/0432/2076/2783/files/79450982634.pdf
    • https://cdn.shopify.com/s/files/1/0428/7217/6796/files/35955678084.pdf
    • https://cdn.shopify.com/s/files/1/0435/9254/8511/files/56552237248.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_off000063e3.bin
55fd74b5f4ab742b4b4825771da6fd1d64c561fa48e7e0bc4a4b266449917e3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63E3 5268 bytes
font_01_sfnt_off000075db.bin
465f91a029e10bf0c03e536c2bf96c562565e221b86708b5064b7b287de5c9bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75DB 10120 bytes
font_02_sfnt_off0000987c.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x987C 4324 bytes

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