Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aaa94880c7a80fb…

MALICIOUS

PDF

67.2 KB Created: 2020-08-20 05:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea3a868e738b510fdf53ad17038d11dc SHA-1: 482b0a0916698e93d381fa903f0dfee7263eb94e SHA-256: 8aaa94880c7a80fb46b53e7dbc0e05c5d9d0d086c63b102076eefa4f97b63e08
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=kbp307+bridge+rectifier+datasheet'. This URL is presented as a datasheet, indicating a social engineering lure to trick the user into clicking the link. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector is the malicious URL embedded within the document.

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=kbp307+bridge+rectifier+datasheet
    • http://niratusiv.mindfuldoodles.com/uploads/1/3/0/8/130814761/5939291.pdf
    • https://cdn.shopify.com/s/files/1/0431/6895/6565/files/vuvowemovokesakofuzajusa.pdf
    • https://cdn.shopify.com/s/files/1/0438/8857/4632/files/mozilla_firefox_version_52.pdf
    • https://cdn.shopify.com/s/files/1/0460/0158/6337/files/appareiller_manette_ps4_android.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/87294954422.pdf
    • https://cdn.shopify.com/s/files/1/0428/6454/1852/files/64563011360.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lalosukiwafigoledexefes.pdf
    • https://cdn.shopify.com/s/files/1/0432/7391/2488/files/96433254905.pdf
    • https://cdn.shopify.com/s/files/1/0430/5348/2138/files/xopefuxuzegebopagowixeguw.pdf
    • https://cdn.shopify.com/s/files/1/0431/3609/0273/files/9607574348.pdf
    • https://cdn.shopify.com/s/files/1/0428/4183/3635/files/38306970013.pdf
    • https://cdn.shopify.com/s/files/1/0435/1351/2100/files/toyota_auris_2020_brochure.pdf
    • https://cdn.shopify.com/s/files/1/0430/3778/6265/files/48235323133.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_off0000c862.bin
0ab462f62b6fa8775862513a3957b6dc963e5bbdf9bad2a7d801b22e7020aad5
pdf-font-stream PDF embedded font (sfnt) at offset 0xC862 5880 bytes
font_01_sfnt_off0000dc61.bin
8ca0edd8f08400eedfcfab9182ffe4a1684c41e13d015982d99f18164a0c4644
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC61 10328 bytes