Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf1c7b3d67a1f12b…

MALICIOUS

PDF

41.0 KB Created: 2020-08-12 00:30:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37470f5c66208dce382a1c4c2a2f50e4 SHA-1: ccf56ec2d92e5c815ee0f2acc7d72449784e644e SHA-256: bf1c7b3d67a1f12b7f0ba014ba34c19dd3733c31012d2f8440a06335063656bc
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, identified as a 'PDF SEO Link Farm'. One of these links, 'https://ttraff.cc/pify?keyword=penatalaksanaan+hernia+inguinalis+pdf', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The primary attack pattern appears to be SEO manipulation or a link farm designed to lead users 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.cc/pify?keyword=penatalaksanaan+hernia+inguinalis+pdf
    • http://takubuxol.harrillconstructioninc.com/uploads/1/3/1/0/131070993/tokuwidoliro_sumupavi_rimawisoxa_sapegorikila.pdf
    • http://files.spiritofaustralia2.com/uploads/1/3/0/7/130740530/kexajoxibafupaw-tuwanaregox-perubamedigijit.pdf
    • http://suwixe.haptotherapiekoningsweg.nl/uploads/1/3/2/7/132741334/marejuled.pdf
    • https://cdn.shopify.com/s/files/1/0428/9524/5475/files/38532771084.pdf
    • https://cdn.shopify.com/s/files/1/0448/1653/1617/files/cute_writer_mac.pdf
    • https://cdn.shopify.com/s/files/1/0430/7327/4018/files/6744717985.pdf
    • https://cdn.shopify.com/s/files/1/0429/3161/7945/files/72557363019.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/27482348981.pdf
    • https://cdn.shopify.com/s/files/1/0437/8250/4600/files/montana_driver_s_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/9912/7957/files/65251483104.pdf
    • https://cdn.shopify.com/s/files/1/0434/1887/8117/files/surah_yasin_rumi.pdf
    • https://cdn.shopify.com/s/files/1/0437/8286/5058/files/19950006024.pdf
    • https://cdn.shopify.com/s/files/1/0432/2990/5058/files/tesajogarexijareropaso.pdf
    • https://cdn.shopify.com/s/files/1/0435/6158/2741/files/les_analyses_mdicales.pdf
    • https://cdn.shopify.com/s/files/1/0428/7247/1715/files/dupezukanalugabuz.pdf
    • https://cdn.shopify.com/s/files/1/0444/8036/4711/files/tonitibelujopafejetaj.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063b1.bin
4c46b0616f804f699996ed28f51ceac6b7883da66217e91a457a7f30eb207da7
pdf-font-stream PDF embedded font (sfnt) at offset 0x63B1 5368 bytes
font_01_sfnt_off000075e6.bin
66e332fa1e4c088780348a90ad170ab7b91355ce8e022eb77b64cd31202eb90f
pdf-font-stream PDF embedded font (sfnt) at offset 0x75E6 9732 bytes