Malicious PDF — malware analysis report

Static analysis result for SHA-256 4192d8bcda0ba61c…

MALICIOUS

PDF

51.6 KB Created: 2020-08-22 01:21:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eecc25453d6431f798b506c51b0b9a38 SHA-1: ead1de53323edf1de5089811735cbcceff777afc SHA-256: 4192d8bcda0ba61ccc72c7ebbc2759ef8e6df6d6a6c639d50a612e33b252d8ab
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. Additionally, it exhibits a PDF link farm heuristic, with numerous links pointing to Shopify domains, likely to obscure the malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The embedded document body text contains the malicious URL, reinforcing its role in the attack.

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=aws+s3+bucket+event+cloudformation
    • http://files.terryjohnwoods.com/uploads/1/3/1/3/131378985/segisazagobiso.pdf
    • http://mujilu.kathysloanephotographer.com/uploads/1/3/0/7/130739693/malanufajodeme.pdf
    • http://files.nicoleorangeartist.com/uploads/1/3/0/7/130775974/43bedeea.pdf
    • https://cdn.shopify.com/s/files/1/0431/7410/1160/files/zirejudepuwures.pdf
    • https://cdn.shopify.com/s/files/1/0434/6901/3158/files/6922821100.pdf
    • https://cdn.shopify.com/s/files/1/0432/1555/2674/files/24853869141.pdf
    • https://cdn.shopify.com/s/files/1/0429/2821/0073/files/zazebemufuxekixejigumapax.pdf
    • https://cdn.shopify.com/s/files/1/0450/3424/2198/files/thyroid_cancer_nccn.pdf
    • https://cdn.shopify.com/s/files/1/0441/2529/0648/files/pdf_buku_agama_islam_kelas_11_kurikulum_2020_penerbit_erlangga.pdf
    • https://cdn.shopify.com/s/files/1/0431/1869/0458/files/mubizizonatoz.pdf
    • https://cdn.shopify.com/s/files/1/0434/4912/2983/files/pebodalotaramenelu.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_off00007d17.bin
29ea57a6847b6e96ec300cfe2a71f521bcfc1a3dd6ff52c70161efb7ce4eafb3
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D17 5676 bytes
font_01_sfnt_off0000905d.bin
28f36dd73a7b6a5842243deee87377ff4636ac743c1fe78fcb21b03a2bceac30
pdf-font-stream PDF embedded font (sfnt) at offset 0x905D 15796 bytes