Malicious PDF — malware analysis report

Static analysis result for SHA-256 b868eebdaa9d09b9…

MALICIOUS

PDF

37.6 KB Created: 2020-08-17 01:27:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf3cb4888e2a203e70e909e2d2de3ac2 SHA-1: 9f175188e518200ae91107994efb91f64b1f7f7a SHA-256: b868eebdaa9d09b94479da4afc1ba5a4be6206cd76d820110f4931f091a2b7c8
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one identified as a known malicious redirector. The ML classifier strongly indicated maliciousness, and the document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=chitralahari+sen+songs' which is also flagged as a malicious redirector. This suggests 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=chitralahari+sen+songs
    • http://momoxi.camogroup.ca/uploads/1/3/1/6/131606227/sorij.pdf
    • http://files.dressagewinnipeg.com/uploads/1/3/1/8/131872105/124af1.pdf
    • http://sonuraxe.n7yv.com/uploads/1/3/2/6/132696030/kakusik.pdf
    • https://cdn.shopify.com/s/files/1/0433/8827/2807/files/bisusovojewikeluneg.pdf
    • https://cdn.shopify.com/s/files/1/0433/1021/9432/files/biochemical_tests_for_identification_of_medical_bacteria.pdf
    • https://cdn.shopify.com/s/files/1/0434/4777/9478/files/yoga_for_beginners_weight_loss_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0447/4916/0602/files/most_accurate_scale.pdf
    • https://cdn.shopify.com/s/files/1/0431/5286/7477/files/basket_case_1982_movie.pdf
    • https://cdn.shopify.com/s/files/1/0433/1533/1227/files/basel_ii_2020.pdf
    • https://cdn.shopify.com/s/files/1/0437/4636/1505/files/zovugukilazulixipew.pdf
    • https://cdn.shopify.com/s/files/1/0439/2783/0696/files/algerieinfo_ga_dir.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bujebunefevefosilipepeju.pdf
    • https://cdn.shopify.com/s/files/1/0432/1784/6427/files/fopizegozemuguku.pdf
    • https://cdn.shopify.com/s/files/1/0432/2482/6014/files/batitomikosipit.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004504.bin
a83ad6d8ab6ea3073965fb910a66c4bc3351fe7fddb9064eec1a6a964ef72906
pdf-font-stream PDF embedded font (sfnt) at offset 0x4504 4852 bytes
font_01_sfnt_off00005577.bin
ede835255d38b3592fd1164440b56fd37562fc4a93122d98e6bf515e098eba70
pdf-font-stream PDF embedded font (sfnt) at offset 0x5577 12688 bytes
font_02_sfnt_off00007e3e.bin
199b2bcf7d5fde5f8752c2bf0665495bb4f82e1ef491258106042c716211d212
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E3E 2836 bytes