Malicious PDF — malware analysis report

Static analysis result for SHA-256 1476a2854a13c83b…

MALICIOUS

PDF

40.6 KB Created: 2020-08-06 04:31:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 445e76273cc325eabf878b89e7f69d3c SHA-1: 72d6c5f90a034aae3183795f1cb8091874cbf86b SHA-256: 1476a2854a13c83bc648622c5c28d27162d49fb8c0a831d92df09b927c81e905
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a link farm designed to redirect users to malicious infrastructure. One of the primary links directs to 'ttraff.ru', a known malicious redirector. The ML classifier also 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.ru/pify?keyword=ecological+niche+modelling+pdf
    • http://files.greentreeassociation.com/uploads/1/3/1/4/131453555/d7af35b5.pdf
    • http://files.rulethelake.com/uploads/1/3/0/8/130815381/3764766.pdf
    • http://files.marinapo.com/uploads/1/3/1/3/131378821/7aa1c9ddd44b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xizujebekox.pdf
    • https://cdn.shopify.com/s/files/1/0433/5442/3464/files/17947372408.pdf
    • https://cdn.shopify.com/s/files/1/0430/6753/9623/files/59038232849.pdf
    • https://cdn.shopify.com/s/files/1/0437/6877/4814/files/kokizejotafupikenilux.pdf
    • https://cdn.shopify.com/s/files/1/0428/8184/3353/files/47313309269.pdf
    • https://cdn.shopify.com/s/files/1/0429/8866/7034/files/arduino_sound_sensor.pdf
    • https://cdn.shopify.com/s/files/1/0432/7079/9516/files/rotadasipitute.pdf
    • https://cdn.shopify.com/s/files/1/0430/2739/8807/files/5073820189.pdf
    • https://cdn.shopify.com/s/files/1/0431/8229/3152/files/ratexenegorupexaxavelujof.pdf
    • https://cdn.shopify.com/s/files/1/0434/6196/8025/files/5697385800.pdf
    • https://cdn.shopify.com/s/files/1/0428/8672/5799/files/gilaturadolazeg.pdf
    • https://cdn.shopify.com/s/files/1/0429/8915/8554/files/rixowimonurini.pdf
    • https://cdn.shopify.com/s/files/1/0437/5835/4584/files/kakiwob.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_off00006246.bin
71576dbc0d46a16ef31f1a7aeedb15e6f79c59bda8878109894f07b74460d758
pdf-font-stream PDF embedded font (sfnt) at offset 0x6246 5252 bytes
font_01_sfnt_off00007405.bin
dd47fb099d8dcb16513ffe7b4d9f9419cb7d43443e496abe997b3b7c98bf2c15
pdf-font-stream PDF embedded font (sfnt) at offset 0x7405 9820 bytes