Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b8afdbefe9af0fe…

MALICIOUS

PDF

34.4 KB Created: 2020-09-01 04:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8e24467b90627620905b18191a8637f SHA-1: 137e5b1f37aefb0ff70bf78bbe4d1609d2193e62 SHA-256: 5b8afdbefe9af0fe42d85898e5fe18f64aa6aac9a9dedd58fc6033e72e0d3b21
154 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=elastic+fitted+bed+sheets+queen+size'. This URL is likely used to redirect users to a malicious site for phishing or malware delivery. The ML classifier also strongly flagged this PDF as malicious. Although no scripts were extracted, the presence of the malicious redirector and the link farm heuristic suggest a malicious intent to lure users to external, potentially harmful, content.

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=elastic+fitted+bed+sheets+queen+size
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/9374a7_0f53e7f6339649b2b2ed731c362a49ec.pdf
    • https://static.usrfiles.com/ugd/3b7182_11019a1029b4422fbc5628f115d9fc0a.pdf
    • https://static.usrfiles.com/ugd/87b9a8_3f3b42ad4bc84f829a7fb2dc33fb747d.pdf
    • https://static.usrfiles.com/ugd/b8c837_825bd7d1a2074e9fba7e7e164ce6d92f.pdf
    • https://cdn.shopify.com/s/files/1/0472/3179/5365/files/alugueres_de_casa_do_esqui_stowe_ver.pdf
    • https://cdn.shopify.com/s/files/1/0457/7178/4358/files/cfr_formation_evreux.pdf
    • https://cdn.shopify.com/s/files/1/0433/9888/9635/files/54138383836.pdf
    • https://cdn.shopify.com/s/files/1/0438/3529/3856/files/induction_motor_vs_synchronous_motor.pdf
    • https://cdn.shopify.com/s/files/1/0436/8905/0265/files/bonus_act_amendment_2020_nepal.pdf
    • https://cdn.shopify.com/s/files/1/0431/8006/4936/files/fezozefap.pdf
    • https://cdn.shopify.com/s/files/1/0430/9663/7597/files/39629006145.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/77363931764.pdf
    • https://cdn.shopify.com/s/files/1/0431/8491/4583/files/mipinejigipusodobozog.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_off000049e2.bin
0e947a8554c328335eecf894eb552ff3efe09b6f214787257218ef15170dfc42
pdf-font-stream PDF embedded font (sfnt) at offset 0x49E2 5288 bytes
font_01_sfnt_off00005bdf.bin
5be18dfb2f28245ccd0045077a90e6a4e7a348d67e7dfa64058606477edfbeff
pdf-font-stream PDF embedded font (sfnt) at offset 0x5BDF 9700 bytes