Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ab1dcbeb76101e0…

MALICIOUS

PDF

46.9 KB Created: 2020-08-10 14:12:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5bfc81cb218fe6119c34d3d6c9d8982f SHA-1: eb7e51f8ec850791cca37ff481d85d63ee45f3fe SHA-256: 6ab1dcbeb76101e023dfdedc7165ddcbcb60210f4e491ddab0986bef45b913a5
162 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though corrupted, appears to be a lure related to educational material, and the heuristic 'PDF_SEO_LINK_FARM' indicates a large number of outbound links, many of which point to potentially malicious or SEO-farmed content. The ML classifier strongly flagged this PDF as malicious.

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/pify?keyword=application+of+derivatives+class+12+ncert+solutions+pdf
    • http://files.credit-hours.com/uploads/1/3/0/7/130739758/bed0b5a.pdf
    • http://files.ericheerspinkceramics.com/uploads/1/3/0/8/130873822/5cd3b0c.pdf
    • http://files.griffindean.com/uploads/1/3/0/8/130874019/nanaxu.pdf
    • http://files.theinnovationcamp.com/uploads/1/3/1/4/131484603/6267351.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5555/4458/files/53959709111.pdf
    • https://cdn.shopify.com/s/files/1/0439/8897/5774/files/bezubujepitizakokamu.pdf
    • https://cdn.shopify.com/s/files/1/0428/8416/9894/files/2744093338.pdf
    • https://cdn.shopify.com/s/files/1/0428/0749/2775/files/35682680741.pdf
    • https://cdn.shopify.com/s/files/1/0431/7731/2411/files/96670008310.pdf
    • https://cdn.shopify.com/s/files/1/0434/3057/6278/files/98484376499.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/4077026649.pdf
    • https://cdn.shopify.com/s/files/1/0439/4962/1406/files/adhesion_testing_methods.pdf
    • https://cdn.shopify.com/s/files/1/0429/9345/1159/files/mesepoxu.pdf
    • https://cdn.shopify.com/s/files/1/0440/0594/9590/files/7335969833.pdf
    • https://cdn.shopify.com/s/files/1/0434/6265/6152/files/kiliv.pdf
    • https://cdn.shopify.com/s/files/1/0433/5520/9879/files/vewefu.pdf
    • https://cdn.shopify.com/s/files/1/0430/2172/9955/files/81005435299.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063db.bin
0eff1fa98a9c9672ef54b3632080d0e363df01d2dfd8f45f09b891868195327d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63DB 5380 bytes
font_01_sfnt_off0000763b.bin
c05c5e6e2f2244b29bddb22443080260b9636a48db4db45000abd3f5ef897ee3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x763B 9924 bytes
font_02_sfnt_off00009877.bin
f7f944af48a1f29a4fc81369acbb7667dc0c0bb312d09d0e658341ed730dbf86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9877 16144 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.