Malicious PDF — malware analysis report

Static analysis result for SHA-256 33f4bfa7ff64eb35…

MALICIOUS

PDF

60.8 KB Created: 2020-07-31 14:02:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7db367256c4c45c4922b9b8d5e251b4 SHA-1: ccfead916a01fb421aa1b0d8af9c8ee9751dc938 SHA-256: 33f4bfa7ff64eb353a6209ebb916507ef0ee1698fb43d92eee8be929b755fb34
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the presence of numerous links suggests an attempt to redirect users to malicious sites, likely 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.cc/pify?keyword=spring+boot+mvc+tutorial+pdf
    • http://files.sccavanners.com/uploads/1/3/1/4/131454352/jakipoji.pdf
    • http://files.broomandblackberries.com/uploads/1/3/2/6/132682070/tefojonosove_wufiwudusabex_ronufepaves.pdf
    • http://files.calijyl.com/uploads/1/3/2/7/132710603/6463826.pdf
    • http://files.beaurobertspianist.com/uploads/1/3/2/6/132682076/fopiz.pdf
    • http://files.texashollandlops.com/uploads/1/3/1/3/131379371/7953459.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8943/6580/files/gitukedekowaj.pdf
    • https://cdn.shopify.com/s/files/1/0432/4550/2626/files/nifiwetuxobaw.pdf
    • https://cdn.shopify.com/s/files/1/0434/2605/4306/files/90326117745.pdf
    • https://cdn.shopify.com/s/files/1/0432/7433/8472/files/78567253040.pdf
    • https://cdn.shopify.com/s/files/1/0437/5108/0090/files/77861958715.pdf
    • https://cdn.shopify.com/s/files/1/0431/4287/3249/files/rataresuwoxiro.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20597849085.pdf
    • https://cdn.shopify.com/s/files/1/0429/7526/4919/files/niweforobop.pdf
    • https://cdn.shopify.com/s/files/1/0430/7540/3936/files/53463286681.pdf
    • https://cdn.shopify.com/s/files/1/0429/8555/4073/files/jizopatopin.pdf
    • https://cdn.shopify.com/s/files/1/0429/1536/5031/files/pazejeb.pdf
    • https://cdn.shopify.com/s/files/1/0436/8983/6697/files/jawobi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000984c.bin
40ad2ac2c1b68a618ee908239698b77690c78c326b318762e9dacfff64115f79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x984C 5364 bytes
font_01_sfnt_off0000aa63.bin
51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA63 1800 bytes
font_02_sfnt_off0000b2f1.bin
a5ec9ea4996b03850e3c291def23928a1463c0886e87abcc7036dfe7579ccb96		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F1 16300 bytes

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