Malicious PDF — malware analysis report

Static analysis result for SHA-256 bce7171745a8a637…

MALICIOUS

PDF

44.7 KB Created: 2020-08-08 22:03:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c764a994a9c630f37a22d06c8f92036 SHA-1: 005eef0165b9056ec1c1de14b229c617341cd7e7 SHA-256: bce7171745a8a6377d215ad00efd26cc3e520db33fa368b71d1a21a6512638ab
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one URL pointing to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that is also present in the link farm. This suggests the PDF is designed to lure users into clicking malicious links, likely leading to further compromise.

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=presentation+speech+example+pdf
    • http://files.jimmysam.com/uploads/1/3/2/6/132681824/xugedi.pdf
    • http://bifurete.neemcalendar.org/uploads/1/3/0/7/130775997/1093533.pdf
    • http://files.attorneystakingaction.com/uploads/1/3/1/8/131856372/2179645.pdf
    • https://cdn.shopify.com/s/files/1/0430/7759/9383/files/malutarazoxakilozijebe.pdf
    • https://cdn.shopify.com/s/files/1/0434/2880/6808/files/2088081374.pdf
    • https://cdn.shopify.com/s/files/1/0437/7791/7085/files/dreamweaver_tutorial_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0437/6756/2391/files/66717702810.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/29878061118.pdf
    • https://cdn.shopify.com/s/files/1/0427/6820/3942/files/suzamu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2177/0656/files/18990047801.pdf
    • https://cdn.shopify.com/s/files/1/0432/2036/9567/files/fajomabegevobeb.pdf
    • https://cdn.shopify.com/s/files/1/0429/6245/2643/files/genos_emotional_intelligence_inventory.pdf
    • https://cdn.shopify.com/s/files/1/0437/7962/1026/files/21387447003.pdf
    • https://cdn.shopify.com/s/files/1/0437/8574/8642/files/resume_for_job_application_sample.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_off00006f60.bin
632b04b0db94f3f05e1089cb76c89a48fa0ea940daf32259f9f638209ab4703d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F60 5464 bytes
font_01_sfnt_off000081d3.bin
e587d93649f32705ee24416fb070a51b36f591a1ca4cdd64bdfa199e8fe3eac9
pdf-font-stream PDF embedded font (sfnt) at offset 0x81D3 10520 bytes