Malicious PDF — malware analysis report

Static analysis result for SHA-256 a146d4a517829730…

MALICIOUS

PDF

32.9 KB Created: 2020-08-29 12:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1950a98c13e43af4b79667d81dd6d19f SHA-1: e1c1168538a263c0b8ae3cdb31ea1a20281ed44c SHA-256: a146d4a5178297302b3f78765abf66d02cd5b893ada4cd9d3cf8ed5a2edd53a3
152 Risk Score

Malware Insights

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

This PDF document was flagged by a machine learning classifier as malicious. It contains a large number of embedded links, with one identified as a known malicious redirector (https://ttraff.com/wix?keyword=viaje+al+oeste+comprar). The document also exhibits characteristics of a link farm, embedding numerous other PDF files hosted on Shopify. This suggests a campaign to distribute malicious content or phishing lures through a network of linked documents.

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/wix?keyword=viaje+al+oeste+comprar
    • https://cdn.shopify.com/s/files/1/0428/8849/5270/files/burda_magazine_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/6815/2216/files/half-_inch_drywall_4_by_8_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0437/6231/9517/files/christian_haggadah.pdf
    • https://cdn.shopify.com/s/files/1/0435/7377/2447/files/call_me_a_spacemen.pdf
    • https://cdn.shopify.com/s/files/1/0432/6676/9058/files/14289057722.pdf
    • https://cdn.shopify.com/s/files/1/0432/5598/8374/files/gufuxizamanel.pdf
    • https://cdn.shopify.com/s/files/1/0428/9308/2783/files/interview_skills_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/0358/3384/files/cub_cadet_1863.pdf
    • https://cdn.shopify.com/s/files/1/0437/5943/5928/files/39864819458.pdf
    • https://static.usrfiles.com/ugd/b8c837_f38cb052435c4fe7a7880d25155df6cc.pdf
    • https://static.usrfiles.com/ugd/b8c837_a6b220cd9027416581aa06a027d7ee98.pdf
    • https://static.usrfiles.com/ugd/b8c837_440114f5513f4854b313b69758118795.pdf
    • https://static.usrfiles.com/ugd/b8c837_115748a129394b8687d7017c60d30874.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_off00004258.bin
9ecced44397a16b09ee78f6fa431d19ebee97b44762e68a62a1ad27a3f9f301b
pdf-font-stream PDF embedded font (sfnt) at offset 0x4258 5120 bytes
font_01_sfnt_off000053b3.bin
5786661e44bbad1e1b8f57b7a6293df641abe7aef45ed8fe665023583597ac82
pdf-font-stream PDF embedded font (sfnt) at offset 0x53B3 10496 bytes