Malicious PDF — malware analysis report

Static analysis result for SHA-256 134d5bbe10d01974…

MALICIOUS

PDF

36.4 KB Created: 2020-08-14 22:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa7b7761d1d4ea889af6bbe83c1f8d39 SHA-1: 8f547669077ad1e0b39858f768e0e3b96fcc2669 SHA-256: 134d5bbe10d01974457608f9f838f1d746c197e5e124c76e1e5e3690312a81b2
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier also strongly flagged this PDF as malicious. The presence of a malicious redirector URL points towards an attempt to lead the user to harmful 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.com/pify?keyword=logo+barcelona+dream+league+soccer+2017
    • http://files.declankeanephotography.com/uploads/1/3/1/4/131438692/xejabigorifanulapuse.pdf
    • http://files.stpetersmorrison.com/uploads/1/3/1/1/131163512/wopabagujanofi-nuvifemodag-xavakawovuju-kefogu.pdf
    • http://pobusi.htkranch.com/uploads/1/3/2/3/132303219/fupawem.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/8583/9003/files/believe_in_yourself_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/9726/7112/files/18662443006.pdf
    • https://cdn.shopify.com/s/files/1/0430/8090/8949/files/74265340352.pdf
    • https://cdn.shopify.com/s/files/1/0447/6190/7351/files/pathophysiology_of_congestive_cardiac_failure.pdf
    • https://cdn.shopify.com/s/files/1/0433/9000/9502/files/84526143491.pdf
    • https://cdn.shopify.com/s/files/1/0431/3900/6632/files/77145372532.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/taselalodomojobuda.pdf
    • https://cdn.shopify.com/s/files/1/0450/4659/5734/files/ladetusoxobefewuw.pdf
    • https://cdn.shopify.com/s/files/1/0427/6604/1244/files/anatomy_and_physiology_coloring_workbook_answers_chapter_14.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_off00004eac.bin
28e72373bd0f629756d65c4600bcee211c2f202651bd676ef7778566684558a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x4EAC 5744 bytes
font_01_sfnt_off0000622a.bin
ab6a23b9d036808528dc9f257746935dadbc3baeb1baeea80a716702c3f881ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x622A 9968 bytes