Malicious PDF — malware analysis report

Static analysis result for SHA-256 797e8ec13485aee9…

MALICIOUS

PDF

48.4 KB Created: 2020-08-19 00:40:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 41698730452e41b37372ada11d749d53 SHA-1: 9745756e49523bdbe2fe7c6e5f5c6f64e0a769fa SHA-256: 797e8ec13485aee927ac6a609caa7aee356a0d217b5fc8a00f69641112efb2f0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links, one of which is identified as a malicious redirector. The document body text, though partially corrupted, suggests a lure related to insurance claims, aiming to trick users into clicking the malicious link. The ML classifier strongly indicates maliciousness, supporting the attack pattern.

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.cc/pify?keyword=nationwide+insurance+claims+form
    • http://gagemujex.depsla.com/uploads/1/3/0/7/130775172/0a82ca2cd3a322.pdf
    • http://buwiza.bigwalnutfriendswhoshare.org/uploads/1/3/1/4/131453145/8744696.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/3625/3087/files/mirror_photo_editor_and_collage.pdf
    • https://cdn.shopify.com/s/files/1/0428/6939/1527/files/37977339765.pdf
    • https://cdn.shopify.com/s/files/1/0434/9417/8982/files/ludozonedigem.pdf
    • https://cdn.shopify.com/s/files/1/0430/8772/4704/files/12066070455.pdf
    • https://cdn.shopify.com/s/files/1/0431/3733/5464/files/39011574368.pdf
    • https://cdn.shopify.com/s/files/1/0427/7587/1654/files/come_thou_fount_violin_duet_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0431/7731/2411/files/fekirutuna.pdf
    • https://cdn.shopify.com/s/files/1/0428/0310/1863/files/71874996120.pdf
    • https://cdn.shopify.com/s/files/1/0435/1596/9688/files/45037320417.pdf
    • https://cdn.shopify.com/s/files/1/0433/4449/4750/files/last_christmas_piano_sheet_music_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/0266/6906/files/selazefika.pdf
    • https://cdn.shopify.com/s/files/1/0437/4082/3706/files/alsco_uniform_linen_service_ltd.pdf
    • https://cdn.shopify.com/s/files/1/0435/7311/7086/files/constitution_of_pakistan_1973_amended_uptodate.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_off00007e97.bin
e9479c06d19775271a77ca743d195514c75bd115b9088b4423fe8ac40e3a5398
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E97 5228 bytes
font_01_sfnt_off00009059.bin
fba478347737a6a28cf6d7b1653a6861b15c960a687849bc2f034441d17007cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x9059 10592 bytes