Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f7708f5509f410f…

MALICIOUS

PDF

39.9 KB Created: 2020-08-21 16:22:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 157434304da24353f91fb9789a2793c7 SHA-1: 4791cf2712349e8b9c313c689b7fd0671d73fcfe SHA-256: 4f7708f5509f410fb98ca912471abacb88b494ac71b4b9478bb41bd28db1f0f9
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.com'. This indicates the document's primary purpose is to redirect users to malicious infrastructure. The presence of numerous other PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to increase visibility and lure victims. 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.com/pify?keyword=cheltenham+township+police+reports
    • http://files.clendenning.com/uploads/1/3/0/9/130969377/0f79f2013.pdf
    • http://mudojevo.helene-steyl-art.com/uploads/1/3/1/8/131857054/dekodek.pdf
    • https://cdn.shopify.com/s/files/1/0434/0734/3779/files/60047046348.pdf
    • https://cdn.shopify.com/s/files/1/0435/8009/6667/files/5837356281.pdf
    • https://cdn.shopify.com/s/files/1/0436/4769/7049/files/amoeba_sisters_video_recap_classification.pdf
    • https://cdn.shopify.com/s/files/1/0438/4119/2101/files/fufijuvepiniroxege.pdf
    • https://cdn.shopify.com/s/files/1/0435/9254/8511/files/wufopuxepaloparegi.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8865/files/nitro_to_word_converter_free_download_for_windows_10.pdf
    • https://cdn.shopify.com/s/files/1/0441/0081/2952/files/cefalohematoma_vs_caput_succedaneum.pdf
    • https://cdn.shopify.com/s/files/1/0434/3142/8248/files/dijelogofodozodowodalax.pdf
    • https://cdn.shopify.com/s/files/1/0434/3817/8470/files/english_tagalog_translator_free_apk.pdf
    • https://cdn.shopify.com/s/files/1/0440/6575/1192/files/zimomemurosivumalajefu.pdf
    • https://cdn.shopify.com/s/files/1/0429/9754/7157/files/gutogaramexi.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_off00005eae.bin
696ac0b2921692dda5dff3e96fc57951f68dae09c47a0715e4d2291c7fd14c11
pdf-font-stream PDF embedded font (sfnt) at offset 0x5EAE 5172 bytes
font_01_sfnt_off00007024.bin
e15a76d39609bf9e2a7a071451c502b4731b5043b5762fef76bd37d0042513b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x7024 10064 bytes