Malicious PDF — malware analysis report

Static analysis result for SHA-256 18be338fc4b16e45…

MALICIOUS

PDF

44.3 KB Created: 2020-08-13 18:20:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad5792c131db253962bededcddcb964f SHA-1: 6e796945d2428b3664ee7adabc49e2a2830daf77 SHA-256: 18be338fc4b16e456735c9663a8df7c625d6e309d1d0f643b6e9530190be24e6
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though partially corrupted, contains text and URLs suggesting a lure for a 'medical power of attorney form' which ultimately leads to the malicious URL. The presence of a download button heuristic further supports the deceptive nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wb?keyword=medical%20power%20of%20attorney%20form%20nc%20pdf
    • http://files.hostessjobitaly.com/uploads/1/3/0/9/130969153/riruwowam_luzegiretuzen.pdf
    • http://files.empactathletics.com/uploads/1/3/0/7/130738712/85a4574561198.pdf
    • http://files.sbtcandles.com/uploads/1/3/0/7/130775918/venanet.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/3377/8597/files/27352531463.pdf
    • https://cdn.shopify.com/s/files/1/0429/7415/0809/files/69200507236.pdf
    • https://cdn.shopify.com/s/files/1/0435/2658/6519/files/82279045913.pdf
    • https://cdn.shopify.com/s/files/1/0429/4888/6684/files/minecraft_op_factions_servers.pdf
    • https://cdn.shopify.com/s/files/1/0430/7743/5556/files/bengali_astrology_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/8486/3893/files/35209150819.pdf
    • https://cdn.shopify.com/s/files/1/0431/8901/0593/files/5231384402.pdf
    • https://cdn.shopify.com/s/files/1/0432/5307/2022/files/23915643371.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nulanevu.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_off00006f1b.bin
346b5dd5e63a98fbc92a5b431c84cf9e8944e67259e9f57776bffc975b59cbde
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F1B 5324 bytes
font_01_sfnt_off00008137.bin
f6ad8328f770ca8e61a557e572e8b0709ccc39e56c6650ea3f8a9e9f419822e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x8137 10412 bytes