Malicious PDF — malware analysis report

Static analysis result for SHA-256 9996f063e0dc7739…

MALICIOUS

PDF

53.0 KB Created: 2020-08-30 22:25:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2aab159cef7801e2a7d51fd78e5e73f8 SHA-1: fb26945c21a87790870e854d9cb41d62b6e97125 SHA-256: 9996f063e0dc7739af292681bc43a53d6c4f267d6aa0d0e7463e6845c045bd8c
154 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/wix?keyword=balboa+hot+tub+heater+manual'. This link is likely intended to lure users to a malicious site. The document also contains a large number of embedded links, many of which point to Shopify domains, suggesting a link farm or SEO poisoning tactic. The ML classifier also strongly flagged this PDF as malicious.

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/wix?keyword=balboa+hot+tub+heater+manual
    • https://cdn.shopify.com/s/files/1/0430/3106/8825/files/kodi_raspberry_pi.pdf
    • https://cdn.shopify.com/s/files/1/0436/9226/1529/files/what_is_a_smart_action_plan_template.pdf
    • https://cdn.shopify.com/s/files/1/0444/3914/2566/files/57429975431.pdf
    • https://cdn.shopify.com/s/files/1/0435/8832/1435/files/ascending_and_descending_worksheet_for_grade_5.pdf
    • https://cdn.shopify.com/s/files/1/0460/2632/6175/files/cch_chuyn_file_nh_sang_jpg.pdf
    • https://cdn.shopify.com/s/files/1/0437/0844/8920/files/kuzivobabutuberisilen.pdf
    • https://cdn.shopify.com/s/files/1/0434/1687/9271/files/mabexezadibep.pdf
    • https://cdn.shopify.com/s/files/1/0433/9594/0519/files/scribblenauts_unlimited_level_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/6694/9786/files/kitifas.pdf
    • https://cdn.shopify.com/s/files/1/0429/9502/4033/files/aprendizaje_colaborativo_en_el_aula.pdf
    • https://cdn.shopify.com/s/files/1/0429/9161/6153/files/majomoginuvomiposelipaku.pdf
    • https://cdn.shopify.com/s/files/1/0427/6381/3020/files/chemistry_dictionary_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/7492/0347/files/megumekineruvoz.pdf
    • https://cdn.shopify.com/s/files/1/0461/8456/2851/files/zirisujibogisiwonodiw.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_off0000919f.bin
f0640f7674ea9f0be1e21c5afe51897cbf1a406836d4dc9dc2356c96ba3fbcab
pdf-font-stream PDF embedded font (sfnt) at offset 0x919F 4936 bytes
font_01_sfnt_off0000a241.bin
7223c6b2ca62c1d62daaaa50818b17a0edc4eb969749a937446db8e418c2088c
pdf-font-stream PDF embedded font (sfnt) at offset 0xA241 11312 bytes