Malicious PDF — malware analysis report

Static analysis result for SHA-256 33a1b845790a848d…

MALICIOUS

PDF

77.9 KB Created: 2020-08-09 15:20:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37c0e47f886e0bf444be40274d2aef20 SHA-1: d09f0c1873587305c35ab1efd6992e629f579295 SHA-256: 33a1b845790a848d9f26d7cd6509d705d219e302681a25d089ba95708ead9edd
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass external link farm, with the primary malicious link redirecting to a URL associated with known malicious infrastructure. The document body, though partially corrupted, contains text related to creating a job application letter, likely a lure to entice users to click the malicious link. The ML classifier strongly indicated maliciousness, and the PDF structure itself points to a link farm designed for SEO manipulation to distribute malicious content.

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=cara+membuat+surat+lamaran+kerja+pdf
    • http://files.splitrocktrickle.com/uploads/1/3/0/7/130775825/58790668a15a.pdf
    • http://files.asiaup.org/uploads/1/3/0/8/130874658/feff7.pdf
    • http://pevazav.amalficoastreview.com/uploads/1/3/1/3/131381464/7592980.pdf
    • http://files.siamsacs.com/uploads/1/3/1/4/131408024/4799147.pdf
    • https://cdn.shopify.com/s/files/1/0427/9740/0223/files/38245962169.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2086/files/40896164695.pdf
    • https://cdn.shopify.com/s/files/1/0428/9508/1625/files/83557791859.pdf
    • https://cdn.shopify.com/s/files/1/0432/5464/4894/files/74501880534.pdf
    • https://cdn.shopify.com/s/files/1/0431/8950/2110/files/air_fuel_ratio_of_diesel_engine.pdf
    • https://cdn.shopify.com/s/files/1/0432/0722/9597/files/read_the_adventures_of_sherlock_holmes.pdf
    • https://cdn.shopify.com/s/files/1/0428/6627/8556/files/sasowemokefipejum.pdf
    • https://cdn.shopify.com/s/files/1/0433/2358/8773/files/fisolotekok.pdf
    • https://cdn.shopify.com/s/files/1/0432/4907/4336/files/biludimupamimajuzil.pdf
    • https://cdn.shopify.com/s/files/1/0428/2961/1171/files/zunupelakunufil.pdf
    • https://cdn.shopify.com/s/files/1/0437/4754/1146/files/soledapakekoxixutedo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9b2.bin
2a69545f8a9d104697b847a0f548493cbc920d2d91a2c508c9ca03512f8941e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B2 6416 bytes
font_01_sfnt_off0000e97c.bin
b2c9cafd881bf8673d4b342df00f612370eb4167815fe272c76c793bf4386354		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE97C 5372 bytes
font_02_sfnt_off0000fba5.bin
47e07df08af29059b37c1e82054702fb42c609f626efe7fa82edc0f1f1d1fd25		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA5 15008 bytes

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