Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd3817004254f514…

MALICIOUS

PDF

46.4 KB Created: 2020-08-08 19:22:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0c73358a9ad2d2289e583caf1e8641b SHA-1: 618b64a2861a82ac68084cbbfa0446833ed066b9 SHA-256: bd3817004254f514ea568ecc0ebe9f1e4af4fa139538f6570a33b86a7bc62c66
152 Risk Score

Malware Insights

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

The PDF document was flagged as malicious due to its inclusion of a link farm pointing to a known malicious redirector. The document body, though heavily obfuscated, contains URLs that are part of this link farm. This suggests the primary purpose is to lure users to malicious sites, likely for phishing or to download further malware.

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.cc/pify?keyword=escala+de+barthel+modificada+portugal+pdf
    • http://files.nausetinsulation.com/uploads/1/3/1/3/131398125/mefitita.pdf
    • http://files.deliveranceforchristians.com/uploads/1/3/1/1/131164462/674bc0e58ae8.pdf
    • http://files.proteus-mrighifu.net/uploads/1/3/1/4/131437932/rufuzisenaw_bixagewezuromez_dasamoxiretozam_pazuxigulumi.pdf
    • https://cdn.shopify.com/s/files/1/0430/2657/9610/files/centennial_college_progress_campus_map.pdf
    • https://cdn.shopify.com/s/files/1/0431/8032/7076/files/31499084366.pdf
    • https://cdn.shopify.com/s/files/1/0432/9550/6592/files/suzofebikegufuzijav.pdf
    • https://cdn.shopify.com/s/files/1/0431/4038/2882/files/4970148646.pdf
    • https://cdn.shopify.com/s/files/1/0431/0797/5335/files/wituropunobatudiz.pdf
    • https://cdn.shopify.com/s/files/1/0434/3264/0679/files/51360351253.pdf
    • https://cdn.shopify.com/s/files/1/0436/2086/0067/files/ramalofosoxog.pdf
    • https://cdn.shopify.com/s/files/1/0432/0513/2456/files/22406643384.pdf
    • https://cdn.shopify.com/s/files/1/0429/3266/6524/files/dynamics_chapter_12_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0436/6427/7657/files/16651712400.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_off000074c2.bin
49a2727065004294c32a5eee8e00578c837bf57ad91b94d80723d91a2d376acc
pdf-font-stream PDF embedded font (sfnt) at offset 0x74C2 5668 bytes
font_01_sfnt_off000087d9.bin
387e66efe86221b86c7290f4fd477c4899f7f2e3e24e2830590a5ef60f38683d
pdf-font-stream PDF embedded font (sfnt) at offset 0x87D9 10716 bytes