Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cbe8c05da2ede9c…

MALICIOUS

PDF

39.3 KB Created: 2020-08-04 21:26:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6f1f04cedd80cc2718eca4cff0a7a18 SHA-1: a9e5e5f1d5fe0928bd18b42cacf052ee915c77e2 SHA-256: 6cbe8c05da2ede9c8f5615901a0666b0fd652f9329b3afbcb9d9b5f1c4b06635
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier also flagged the PDF as malicious. The presence of a link farm suggests an attempt to drive traffic to potentially malicious sites, possibly for phishing or malware distribution.

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=cannonball+adderley+omnibook+eb+pdf
    • http://files.knaylorpaintings.com/uploads/1/3/1/0/131070888/webupefusogabudolox.pdf
    • http://files.mustardseedsgrow.com/uploads/1/3/1/4/131438847/160cf7f15a.pdf
    • http://files.artbyjulieh.com/uploads/1/3/1/0/131070493/ccad03741.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/7994/9718/files/topajegizakevadito.pdf
    • https://cdn.shopify.com/s/files/1/0432/3331/2925/files/sunobufajawi.pdf
    • https://cdn.shopify.com/s/files/1/0433/6146/8574/files/71973045581.pdf
    • https://cdn.shopify.com/s/files/1/0431/2478/5319/files/bar_keepers_friend_msds.pdf
    • https://cdn.shopify.com/s/files/1/0430/5348/2135/files/caldwell_chronograph_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/6807/0815/files/express_js_tutorial_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/7730/2427/files/99165181636.pdf
    • https://cdn.shopify.com/s/files/1/0430/9748/9561/files/69686867390.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/numerical_methods_chapra_7th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0434/5731/4977/files/91363267114.pdf
    • https://cdn.shopify.com/s/files/1/0431/6348/4315/files/97527408985.pdf
    • https://cdn.shopify.com/s/files/1/0431/9058/3458/files/windows_xp_tablet_pc_edition_iso.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_off00005a9c.bin
ca0c048170c8fd0e94dd9b5a63e90ff71d0f10b090578680cf35015940218a49
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A9C 5220 bytes
font_01_sfnt_off00006c4d.bin
0da33b1ecec7446a95840f329f70d38fdcf87078f1bab3bd79ae45ba9dfa35bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C4D 10528 bytes