Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b458c21860a207c…

MALICIOUS

PDF

41.4 KB Created: 2020-08-07 07:06:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f4525ff309e99ffbac26c2ba38f55ac SHA-1: 0b848939e1244a82de6d1ebdbbad8c2cd0fa0b9d SHA-256: 5b458c21860a207c3d68da8c84ea2ccc6454bd9636877b9031cd67fc38c3a223
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. While the document body is heavily obfuscated, the presence of a malicious redirector and a large number of external links suggests a campaign to drive traffic, potentially for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack.

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=effortless+mastery+book+pdf
    • http://files.wisefeline.com/uploads/1/3/2/7/132740378/9546923.pdf
    • http://files.fellowshipcommunitychurchok.org/uploads/1/3/2/6/132696274/1338978.pdf
    • http://getafo.mrbah.com/uploads/1/3/1/8/131856372/799968.pdf
    • http://files.steadfaststeeds.org/uploads/1/3/1/4/131406449/4966789.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/7207/0556/files/43382276659.pdf
    • https://cdn.shopify.com/s/files/1/0433/6245/1611/files/gadevipasavavawugig.pdf
    • https://cdn.shopify.com/s/files/1/0435/0076/5336/files/bmi_chart_for_male_and_female.pdf
    • https://cdn.shopify.com/s/files/1/0434/8418/4728/files/19198631587.pdf
    • https://cdn.shopify.com/s/files/1/0437/1467/4841/files/70971870619.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/89462818099.pdf
    • https://cdn.shopify.com/s/files/1/0436/5461/1102/files/wuponorasukaloriwenafar.pdf
    • https://cdn.shopify.com/s/files/1/0433/3754/7929/files/kivegujeniw.pdf
    • https://cdn.shopify.com/s/files/1/0429/4295/5676/files/39515575773.pdf
    • https://cdn.shopify.com/s/files/1/0436/1761/6034/files/bopimopalibanev.pdf
    • https://cdn.shopify.com/s/files/1/0430/7304/4642/files/93170594987.pdf
    • https://cdn.shopify.com/s/files/1/0429/3738/5123/files/zopov.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_off00006307.bin
199808c5b0b9e73b9e5e7fea3e60392392880679d670fff1a86c9982bd5dd180		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6307 5448 bytes
font_01_sfnt_off00007585.bin
9c0d7dc57220d55afb0514925967eab4c4a7d6d488fd090762487d769bc242c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7585 10308 bytes

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