Malicious PDF — malware analysis report

Static analysis result for SHA-256 018808c08f78fb38…

MALICIOUS

PDF

39.0 KB Created: 2020-08-23 15:21:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b353be5f163d353a1320ed68a7a562de SHA-1: a1e4b20e0d56929c042323de9d24896b9fda203d SHA-256: 018808c08f78fb38768ec23845fda79c927f8034a770e195ccc9f5889f768416
154 Risk Score

Malware Insights

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

The PDF contains a link to a redirector service, which in turn points to a large number of other PDF files hosted on various domains. The primary link is presented as a free tool download, indicating a social engineering lure. The ML classifier strongly supports the malicious nature of this PDF.

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=autodesk+uninstall+tool+free
    • http://poviwibi.sporkbooks.com/uploads/1/3/0/7/130740496/118692.pdf
    • http://jigafutu.teannashantese.com/uploads/1/3/1/4/131454057/lulinowinefizowit.pdf
    • http://files.ogilvies.scot/uploads/1/3/0/8/130873822/3082025.pdf
    • http://rimupuk.feralaffairs.org/uploads/1/3/0/7/130738731/20c9801.pdf
    • http://files.revelationofyeshuamessiah.com/uploads/1/3/1/6/131606262/valun.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/6768/6558/files/temigoxugodotumixogofiva.pdf
    • https://cdn.shopify.com/s/files/1/0432/3010/1668/files/85974753571.pdf
    • https://cdn.shopify.com/s/files/1/0431/1000/6940/files/18417348119.pdf
    • https://cdn.shopify.com/s/files/1/0447/0459/6122/files/captain_america_civil_war_script_download.pdf
    • https://cdn.shopify.com/s/files/1/0451/7701/2373/files/lipid_lowering_guidelines_2018.pdf
    • https://cdn.shopify.com/s/files/1/0431/7767/2868/files/america_s_history_8th_edition_online_textbook_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/8915/8554/files/15659410242.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_off00005ac0.bin
34608645287818da188ee9193ff57646513c0fe4e2b51c2dac22aeebc450867a
pdf-font-stream PDF embedded font (sfnt) at offset 0x5AC0 4952 bytes
font_01_sfnt_off00006ba4.bin
e6b9c6b53d2762329c6c6940081d717bd4fef554b02c2ddfaf01e0cf6115e81f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6BA4 10496 bytes