Malicious PDF — malware analysis report

Static analysis result for SHA-256 90d580409ee4aac3…

MALICIOUS

PDF

46.1 KB Created: 2020-09-01 04:29:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f232ab73a052f0c91b4df17a94b393de SHA-1: 8b2855e5b48f96e1ffdbad9d9fa5a6617c5365d0 SHA-256: 90d580409ee4aac3210fd9ca4ceb600b50f5fc4ac15f011b32a20583f4999705
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious URL, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to 'birthday gift images hd' and the malicious URL itself, suggesting a lure. The PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, many of which point to benign content, likely to mask the malicious redirector.

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/wix?keyword=birthday+gift+images+hd
    • https://static.usrfiles.com/ugd/9cfd0a_c4590f36d3c84835b596ea3704cb691b.pdf
    • https://static.usrfiles.com/ugd/0511f5_80fcf924eeed4b9297af6b5c1849707b.pdf
    • https://static.usrfiles.com/ugd/2ddd39_9f9835b24b4748f185cb4fd5c19915f7.pdf
    • https://static.usrfiles.com/ugd/764aaa_de3c205d95764a2486b255c9777bd67e.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wososopozabe.pdf
    • https://cdn.shopify.com/s/files/1/0433/7742/6584/files/24244129376.pdf
    • https://cdn.shopify.com/s/files/1/0430/7327/4018/files/7100396775.pdf
    • https://cdn.shopify.com/s/files/1/0436/5362/8062/files/63777415799.pdf
    • https://static.usrfiles.com/ugd/b8c837_d274c9f52c3740d0b0c48013583d06c0.pdf
    • https://static.usrfiles.com/ugd/b8c837_4a12b8c2a6b14c78b162a8183953af0f.pdf
    • https://static.usrfiles.com/ugd/c1615c_d572887de02f48ea8df5ea3002175d7a.pdf
    • https://cdn.shopify.com/s/files/1/0435/1302/0570/files/bivugexuketafofudot.pdf
    • https://cdn.shopify.com/s/files/1/0433/3446/7752/files/doluma.pdf
    • https://cdn.shopify.com/s/files/1/0428/9839/1196/files/gonorrhea_treatment_guidelines_australia.pdf
    • https://cdn.shopify.com/s/files/1/0434/0331/3308/files/bootstrap_components_template_free.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_off00007404.bin
892b0d1f8eec1c4ed1f18bdbacdd1642981bbe22d46b7ae9cd4736e2439d819b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7404 5440 bytes
font_01_sfnt_off00008669.bin
56690f3496c85a68a0fb4c9463fca893e3b767420c8ff3f1ec153470de22240d
pdf-font-stream PDF embedded font (sfnt) at offset 0x8669 11004 bytes