Malicious PDF — malware analysis report

Static analysis result for SHA-256 035d24e1c9858a2b…

MALICIOUS

PDF

68.1 KB Created: 2020-08-04 01:41:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f74287115a52dadc485587509e2c85fb SHA-1: d8b9171845a722ee8bfa065630fe2d68521cee1f SHA-256: 035d24e1c9858a2b195cd2a429511fb63e6fceffe06de546f8625860021c96d1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a significant number of embedded links, identified as a link farm, with one URL pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

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.ru/pify?keyword=sistema+de+calidad+total+tqm+pdf
    • http://files.myphumc.com/uploads/1/3/0/8/130874451/8646049.pdf
    • http://files.flowersfromthedead.com/uploads/1/3/1/4/131437005/mutuwafefatobe-nixebopim.pdf
    • http://gozowiwo.jamesedwardbecton.com/uploads/1/3/1/4/131437508/vegivepepigo.pdf
    • http://files.richardbrooksinvestigations.com/uploads/1/3/2/6/132683137/5dbcb2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8058/1274/files/jaxinujazuvar.pdf
    • https://cdn.shopify.com/s/files/1/0435/7803/2296/files/zekiwidofikubajofapu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/woziki.pdf
    • https://cdn.shopify.com/s/files/1/0432/5539/8563/files/70190046998.pdf
    • https://cdn.shopify.com/s/files/1/0427/9851/4343/files/slam_walter_dean_meyers.pdf
    • https://cdn.shopify.com/s/files/1/0437/9590/6721/files/86917217333.pdf
    • https://cdn.shopify.com/s/files/1/0428/3842/5767/files/wesowojigogikidad.pdf
    • https://cdn.shopify.com/s/files/1/0429/5340/8675/files/pebabima.pdf
    • https://cdn.shopify.com/s/files/1/0435/4713/2068/files/byomkesh_bakshi_stories_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0431/8353/8340/files/poison_ivy_killer_lowes.pdf
    • https://cdn.shopify.com/s/files/1/0431/2314/6906/files/satagetatobak.pdf
    • https://cdn.shopify.com/s/files/1/0438/7930/1288/files/alphabetical_list_of_countries.pdf
    • https://cdn.shopify.com/s/files/1/0433/1087/4777/files/70353658479.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c89d.bin
fb4899b6e515148681d95b669116ee240b84c59bb59360208372bb8a53357889		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC89D 5432 bytes
font_01_sfnt_off0000db0a.bin
fc8b1b8bde97f074ea808b1fadcf59d0556257562e2e18df86167177ed498e45		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0A 11748 bytes

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