Malicious PDF — malware analysis report

Static analysis result for SHA-256 28faacda67bfcd30…

MALICIOUS

PDF

67.2 KB Created: 2020-08-22 01:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f22d54a1ac490db2550b586fd947051e SHA-1: 8e05be2cbbf35f4ef68f078a00d1bebc8732bc43 SHA-256: 28faacda67bfcd30703b091534df5f1816d2407f9e97e9adf5ba80680a796d45
152 Risk Score

Malware Insights

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

The PDF was flagged by a critical heuristic for linking to known malicious redirector infrastructure. Additionally, it contains a mass of external PDF links, many hosted on Shopify, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the PDF structure itself is the delivery mechanism.

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.ru/pify?keyword=2018+movies+malayalam
    • http://files.outfitterswig.com/uploads/1/3/1/6/131606343/24edbfd2074007.pdf
    • http://files.droptestmedia.com/uploads/1/3/1/3/131380000/xuzobugolavuw.pdf
    • http://bepamem.greenscrub.ca/uploads/1/3/0/8/130814729/135209.pdf
    • http://files.stseachnalls.ie/uploads/1/3/0/8/130814967/5051278.pdf
    • http://gopidoko.dirtypennyvapeandale.com/uploads/1/3/2/6/132681670/0484f7.pdf
    • http://gopidoko.dirtypennyvap
    • https://cdn.shopify.com/s/files/1/0434/3001/9237/files/aptitude_test_verbal_reasoning.pdf
    • https://cdn.shopify.com/s/files/1/0437/3177/9733/files/dikatofodopasopaz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/15074065918.pdf
    • https://cdn.shopify.com/s/files/1/0432/1017/8717/files/32248422527.pdf
    • https://cdn.shopify.com/s/files/1/0437/2021/2645/files/zufidotonakasu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wefudebavisizaku.pdf
    • https://cdn.shopify.com/s/files/1/0435/7016/7967/files/ynab_tracking_accounts.pdf
    • https://cdn.shopify.com/s/files/1/0432/9390/0958/files/sogojumegefiji.pdf
    • https://cdn.shopify.com/s/files/1/0438/7789/2251/files/pdf._js_viewer_hide_toolbar.pdf
    • https://cdn.shopify.com/s/files/1/0430/0403/5221/files/tatebulazoruto.pdf
    • https://cdn.shopify.com/s/files/1/0431/7931/1253/files/bigapinozatavulusude.pdf
    • https://cdn.shopify.com/s/files/1/0436/0414/8382/files/11749846363.pdf
    • https://cdn.shopify.com/s/files/1/0431/8386/6007/files/mowejisijudenoza.pdf
    • https://cdn.shopify.com/s/files/1/0433/4364/2792/files/cat_text_emoji.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
stream_005_off0000bf7f.bin
66ed7de9485b3c28cb803994d22eb27438572c9593fd053733730f44587f22d5		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xBF7F 8020 bytes
font_00_sfnt_off0000ad7a.bin
2d47ca5378e402da6164cd7a407cbf5201d9721b9de8c3e4f74d5f90460466cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD7A 5320 bytes
font_02_sfnt_off0000dba2.bin
f6169d478a78dc3951eeffb5efb99bdbffa15c87db21d2f5364285bab00f695f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA2 10396 bytes

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