Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f83d9ef19eecdad…

MALICIOUS

PDF

41.7 KB Created: 2020-08-09 16:44:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ecbb2aa04caf5e4d81932dbcebc9d37a SHA-1: 33f4871e845ff0e9664838179e5e6b994e4386a5 SHA-256: 3f83d9ef19eecdad4ef33740ec449754dd04ab1a1ff6e49a51913d25ded7a08b
154 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many of which point to external resources, indicating a link farm. One critical heuristic identified a link to known malicious redirector infrastructure. The document body also contains a direct link to this malicious redirector, suggesting the primary intent is to redirect users to potentially harmful content. The ML classifier strongly supports the malicious nature of this PDF.

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.ru/pify?keyword=wings+of+fire+in+kannada+pdf+download
    • http://xelimav.caseyclaros.com/uploads/1/3/0/8/130814328/7209194.pdf
    • http://files.creartistry.com/uploads/1/3/0/7/130775768/4605942.pdf
    • http://kuburupa.missouri-fcs.com/uploads/1/3/1/6/131607029/272122f325.pdf
    • http://files.foundationscareercoaching.ca/uploads/1/3/0/7/130775346/poduwofe-wupetiteromav.pdf
    • https://cdn.shopify.com/s/files/1/0428/2925/0719/files/fenilepemulo.pdf
    • https://cdn.shopify.com/s/files/1/0430/8267/8433/files/sudifikisizipigewemuzuge.pdf
    • https://cdn.shopify.com/s/files/1/0434/0328/0551/files/94796980367.pdf
    • https://cdn.shopify.com/s/files/1/0430/9729/2949/files/mindray_bc_3200_auto_hematology_analyzer.pdf
    • https://cdn.shopify.com/s/files/1/0431/5054/0964/files/lanisuxoruzen.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tefukina.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/jaxebinixenevo.pdf
    • https://cdn.shopify.com/s/files/1/0431/4421/6727/files/75502343668.pdf
    • https://cdn.shopify.com/s/files/1/0433/4249/5895/files/puwidisabalowagateke.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pawatofamilafal.pdf
    • https://cdn.shopify.com/s/files/1/0431/5689/7947/files/8342866141.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_off00006620.bin
96bb4c187651fe8529aaf70c9f0e24791e8b3a5a8bb25c90653d12122b086bdc
pdf-font-stream PDF embedded font (sfnt) at offset 0x6620 5380 bytes
font_01_sfnt_off0000789e.bin
b14f6c1352916a7e238d78614205283fe7aa010b1f4158466d6f24285f366793
pdf-font-stream PDF embedded font (sfnt) at offset 0x789E 9844 bytes