Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bba724376d6bca9…

MALICIOUS

PDF

67.8 KB Created: 2020-08-26 20:38:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3646c6271047966c4ea7bf252a02c1ec SHA-1: 70520c2cebc34b7806be64d591164bedd1982c04 SHA-256: 9bba724376d6bca9d3ce574979011f6eebad5970d38537ba2c869e92881f6060
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=examkrackers+10th+edition+pdf+download+reddit'. This URL is embedded within the document body, suggesting a social engineering lure to trick users into downloading potentially malicious content. The presence of numerous other external PDF links, many hosted on Shopify, further indicates a link farm or SEO poisoning tactic to attract victims. The ML classifier also strongly flagged this PDF as malicious.

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=examkrackers+10th+edition+pdf+download+reddit
    • http://xigoreg.rintheyordle.com/uploads/1/3/1/0/131070420/xexomuputakuj.pdf
    • http://files.andrewkinschereptportfolio.com/uploads/1/3/0/7/130775942/2844323.pdf
    • https://cdn.shopify.com/s/files/1/0437/3735/0309/files/fotigo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0702/5056/files/29564332569.pdf
    • https://cdn.shopify.com/s/files/1/0432/4625/6295/files/batepugesosukanonapomiv.pdf
    • https://cdn.shopify.com/s/files/1/0429/9345/1159/files/8370775362.pdf
    • https://cdn.shopify.com/s/files/1/0435/6482/6783/files/68463209157.pdf
    • https://cdn.shopify.com/s/files/1/0430/6075/6641/files/schneider_switches_catalogue_malaysia.pdf
    • https://cdn.shopify.com/s/files/1/0430/9060/8285/files/mipizotejuni.pdf
    • https://cdn.shopify.com/s/files/1/0434/7586/1656/files/perexus.pdf
    • https://cdn.shopify.com/s/files/1/0434/8759/2608/files/jebato.pdf
    • https://cdn.shopify.com/s/files/1/0437/1942/6198/files/bonizimopuvosisawanuxa.pdf
    • https://cdn.shopify.com/s/files/1/0437/6517/0334/files/autoecologia_y_sinecologia_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0439/1501/8392/files/google_chrome_web_to.pdf
    • https://cdn.shopify.com/s/files/1/0449/2463/3243/files/html_to_generator_c_free.pdf
    • https://cdn.shopify.com/s/files/1/0436/3413/1104/files/encyclopdie_des_desserts_gratuit.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_off0000c262.bin
e30dd6e9434422d2d8069d8cc91697ee4a946c4719acbef1e1b140888f581656		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC262 5768 bytes
font_01_sfnt_off0000d5ff.bin
1ee92202448925bdade1b6d0d5118c6bb3c5aef29ad2efce87da8ef0dcab3b1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FF 13732 bytes

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