Malicious PDF — malware analysis report

Static analysis result for SHA-256 bce68bcc984abf0f…

MALICIOUS

PDF

34.4 KB Created: 2020-10-04 16:13:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: bdeac1fd9076793c29abbc8fc82e9f2b SHA-1: 65fd9815e4fb53e46ac9989862525bce64554186 SHA-256: bce68bcc984abf0f70159ca87746f036b3e81ed5fac4c779f3c629de0f0b29cd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the same URL found in the heuristic, suggesting an attempt to direct users to potentially harmful content. The presence of a large number of external PDF links further supports a link farm or redirection scheme.

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.link/pify?keyword=weather+stamford+ct+06902+hourly In PDF document text
    • http://files.fauxmesticgoddess.com/uploads/1/3/1/8/131856381/gevaxil.pdfIn PDF document text
    • http://files.pleikuab.com/uploads/1/3/0/8/130813317/batozevu_numev.pdfIn PDF document text
    • http://files.pwessays.com/uploads/1/3/1/4/131407687/xoxuwejoni_fakuz_wisimarudewifa.pdfIn PDF document text
    • http://files.jandabendquilts.com/uploads/1/3/2/6/132683328/makovigixunexedo.pdfIn PDF document text
    • http://files.lindseybarlagthornton.com/uploads/1/3/0/9/130969036/7074136.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/8657/5771/files/weduvovanusutitekiw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3409/9362/files/ap_human_geography_exam_review_packet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7936/7845/files/71271969092.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3301/3655/files/79981584367.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/8846/5051/files/and_then_there_were_none_audiobook_chapter_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6746db9-2fbf-4cf7-82c8-5035cf87b1c7/52633619675.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15751dd7-9957-432b-8c16-82036b21c167/buwujoxedonijez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/622a9425-5418-46c7-9f64-5475abe670d4/64020427592.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4725 5960 bytes
SHA-256: 7d374eeab8626f912c9bc7addfe82438e9a50cc7c10debf99f9fbadb7f6a5254
font_01_sfnt_off00005b55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B55 9852 bytes
SHA-256: 7735e92253b3fd780126bebd8bfa115a1cccb3425bab25c3b4c3bf30f8bc378f

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