Malicious PDF — malware analysis report

Static analysis result for SHA-256 3420dbf37bd80be3…

MALICIOUS

PDF

33.4 KB Created: 2020-08-10 15:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e98a8356dc457487bd9620269a965660 SHA-1: 142d15202c95223f053e041870235da4377a44dd SHA-256: 3420dbf37bd80be30f1b3eb924457f0fcdccdd403468cb2bf76840cc7dd6aa98
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised as a tool for converting APKs to Word documents. This suggests a phishing or scam attempt. The presence of a large number of external links, many pointing to PDF files hosted on Shopify, indicates a link farm designed to manipulate search engine results, likely to drive traffic to the malicious redirector. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of the payload.

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.ru/pify?keyword=apk+convert+pdf+ke+word+di+android
    • http://files.barbechamblissauthor.com/uploads/1/3/0/7/130740563/3626560.pdf
    • http://tajawoder.theguitarmedic.net/uploads/1/3/1/4/131406436/xokatugesanepomup.pdf
    • http://files.vislitsandbox.com/uploads/1/3/0/9/130969965/repafoxorezu_mivukag.pdf
    • http://gupodepu.ctsulianah.com/uploads/1/3/2/6/132696414/nuratenitizafemi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5706/9736/files/42098292353.pdf
    • https://cdn.shopify.com/s/files/1/0440/4376/3862/files/15387841186.pdf
    • https://cdn.shopify.com/s/files/1/0438/8667/4088/files/castrol_edge_turbo_diesel_5w_40.pdf
    • https://cdn.shopify.com/s/files/1/0429/9476/1877/files/anatomie_de_appareil_digestif.pdf
    • https://cdn.shopify.com/s/files/1/0428/3518/1724/files/is_kissanime_down.pdf
    • https://cdn.shopify.com/s/files/1/0434/0459/1255/files/96184738747.pdf
    • https://cdn.shopify.com/s/files/1/0432/4953/3088/files/the_celta_course_trainee_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0440/7181/3285/files/tipos_de_actuadores.pdf
    • https://cdn.shopify.com/s/files/1/0437/0300/9430/files/7757574226.pdf
    • https://cdn.shopify.com/s/files/1/0427/7387/2807/files/mekesofaxovojujudijaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/6728/5410/files/class_12_accountancy_project_segment_analysis.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_off00004739.bin
8eb69e4ef4a35c0f5c5e6092314ead2323fb0f017da8f372174f3e5d499ac1ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4739 5144 bytes
font_01_sfnt_off000058d6.bin
9a9c3cf016f1d0f73f2b9bab9f36f10c083ca72aaa9cb5277f9c9253d2dd7142		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58D6 9328 bytes

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