Malicious PDF — malware analysis report

Static analysis result for SHA-256 0875563fff1987e5…

MALICIOUS

PDF

32.8 KB Created: 2020-08-20 04:11:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6f009898dc5d1f2c6df90eeedd87675 SHA-1: ca86ecfd339e48c607f86f3456c8f64f6e4dfe52 SHA-256: 0875563fff1987e5ff4740edb2a2ddf929a65f8500de4802324b02b0b5961379
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The primary malicious URL, https://ttraff.com/pify?keyword=proportionality+graphs+worksheet, is designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, contains references to the worksheet and the malicious URL, suggesting a lure for phishing or malware delivery. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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.com/pify?keyword=proportionality+graphs+worksheet
    • http://files.clarkredangus.com/uploads/1/3/1/3/131381078/bajinebopu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/7430/6719/files/74361091935.pdf
    • https://cdn.shopify.com/s/files/1/0431/5519/4011/files/fusukowekalefevoxili.pdf
    • https://cdn.shopify.com/s/files/1/0432/0316/6369/files/39556543346.pdf
    • https://cdn.shopify.com/s/files/1/0437/9095/8749/files/94738584878.pdf
    • https://cdn.shopify.com/s/files/1/0428/1909/2647/files/how_to_say_guide_me_in_spanish.pdf
    • https://cdn.shopify.com/s/files/1/0438/4771/2928/files/58303234796.pdf
    • https://cdn.shopify.com/s/files/1/0430/9496/6421/files/xuwezikabipo.pdf
    • https://cdn.shopify.com/s/files/1/0438/9994/5112/files/josuzeb.pdf
    • https://cdn.shopify.com/s/files/1/0430/7963/1001/files/murujojemewuviruwo.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_off0000433e.bin
d4e70da04f973e4ad486346c68dbd9af8b2710ee4839de22df7a40ab0279854e
pdf-font-stream PDF embedded font (sfnt) at offset 0x433E 5340 bytes
font_01_sfnt_off00005570.bin
166315070887e72e19ef0d19baaea0d269674a45e120966c0c3194fb37835635
pdf-font-stream PDF embedded font (sfnt) at offset 0x5570 9732 bytes