Malicious PDF — malware analysis report

Static analysis result for SHA-256 8739b2f4bc1e707e…

MALICIOUS

PDF

32.8 KB Created: 2020-08-16 20:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cbf367790ed1721cb11dfe4ed0bf9ea9 SHA-1: 6612275236a2a5125ccf2b1f276d88aaaa16b38b SHA-256: 8739b2f4bc1e707e609a938360ce13b8e713b1602ed9fa8a4252282efda84f9e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded links that point to a known malicious redirector infrastructure, specifically `https://ttraff.ru/pify`. The document body, though heavily obfuscated, contains text related to a 'Casio fx 991es plus calculator manual', suggesting a lure to entice users to click the malicious link. The presence of a large number of external PDF links, many hosted on Shopify, further indicates a link farm designed 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.ru/pify?keyword=casio+fx+991es+plus+calculator+manual
    • http://files.tasteofmansfieldct.org/uploads/1/3/1/3/131378993/xalosapupexab-zikazijogoga-mazifipoxumis-polebafawefel.pdf
    • https://cdn.shopify.com/s/files/1/0434/0082/2934/files/21124849284.pdf
    • https://cdn.shopify.com/s/files/1/0438/9391/5800/files/mumakujolize.pdf
    • https://cdn.shopify.com/s/files/1/0438/7376/3496/files/associer_plusieurs_en_un_seul.pdf
    • https://cdn.shopify.com/s/files/1/0431/4903/3640/files/26600416857.pdf
    • https://cdn.shopify.com/s/files/1/0431/5499/7402/files/70787819788.pdf
    • https://cdn.shopify.com/s/files/1/0437/3689/1544/files/92664602218.pdf
    • https://cdn.shopify.com/s/files/1/0432/4684/6107/files/99794049455.pdf
    • https://cdn.shopify.com/s/files/1/0434/6013/3031/files/kti_pneumonia_pada_anak.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000042fd.bin
eb23be852df3417ad6df491c6d3858d7162a33577674ddd8d8b5b48f59aa568d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x42FD 5344 bytes
font_01_sfnt_off0000551a.bin
3262dd176101e16c9d4772d2e888d18d32fd944c7d322d590b5dc596bfc3818f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x551A 9820 bytes

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