Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5e27e4091b5d3d7…

MALICIOUS

PDF

46.5 KB Created: 2020-08-17 07:27:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d897328025c084bfeaad741544190fdc SHA-1: de2e077ba19a548d0728b760f917eed6899e4c8f SHA-256: c5e27e4091b5d3d797ca699624bc422ff72da1fc54f3071978a3f483e2e8ddd8
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'adding and subtracting decimals year 6 worksheet' and the malicious URL, suggesting a lure to disguise malicious activity. The presence of a PDF_MALICIOUS_REDIRECTOR_LINK heuristic firing further supports this. No scripts were extracted from this sample, but the link farm and redirector indicate a phishing or malware distribution attempt.

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=adding+and+subtracting+decimals+year+6+worksheet
    • http://files.latinmasshv.org/uploads/1/3/1/1/131163957/d1bcab366e5c421.pdf
    • https://cdn.shopify.com/s/files/1/0431/3477/9553/files/causes_of_deforestation_in_zambia.pdf
    • https://cdn.shopify.com/s/files/1/0438/9994/5112/files/nujajelavamusatutidat.pdf
    • https://cdn.shopify.com/s/files/1/0432/0952/3355/files/vinulejudefuromaxigi.pdf
    • https://cdn.shopify.com/s/files/1/0429/7146/3831/files/vekisikokozo.pdf
    • https://cdn.shopify.com/s/files/1/0443/0348/3036/files/emotional_intelligence_books.pdf
    • https://cdn.shopify.com/s/files/1/0441/3734/9272/files/xawuxazejelerufijile.pdf
    • https://cdn.shopify.com/s/files/1/0431/3815/4653/files/xufavedazonevafasukopotam.pdf
    • https://cdn.shopify.com/s/files/1/0436/7400/9753/files/65498732373.pdf
    • https://cdn.shopify.com/s/files/1/0429/6874/4087/files/taxugit.pdf
    • https://cdn.shopify.com/s/files/1/0429/1470/9670/files/baldor_algebra_book.pdf
    • https://cdn.shopify.com/s/files/1/0432/8597/1110/files/16824762909.pdf
    • https://cdn.shopify.com/s/files/1/0434/0360/8231/files/oxford_dictionary_offline_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/6968/6431/files/46853287138.pdf
    • https://cdn.shopify.com/s/files/1/0432/3472/1959/files/fluid_mechanics_hibbeler.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_off0000763d.bin
62522269ee5fd72b014700bd6b5c0b899157cb4876764b7c87417132c2c04d23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x763D 5896 bytes
font_01_sfnt_off00008a2d.bin
2db0c962d8229bf939f461d6a4daf9c4d62a6acc1a2ebe675152e03a2f27b298		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A2D 10008 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.