Malicious PDF — malware analysis report

Static analysis result for SHA-256 87b434fac3c16c36…

MALICIOUS

PDF

40.8 KB Created: 2020-08-05 02:43:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b9b7931914bbaf742f4cb39c35ae03f SHA-1: 6913fa7c4317d0018e8e7ccfa8dbf631ae54ec1b SHA-256: 87b434fac3c16c3699cf750f312cf9e637e59005af039873fbf9f212320b4f05
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, but one critical link redirects to a known malicious domain. This suggests a link farm or SEO poisoning tactic to distribute malicious content. The document body, though heavily obfuscated, contains text related to 'physiology practical book pdf free download' and a URL, indicating a lure to entice users to click on the malicious links.

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=physiology+practical+book+pdf+free+download
    • http://files.kelseyeliason.com/uploads/1/3/0/7/130775846/1035434.pdf
    • http://files.bisbeechorus.org/uploads/1/3/0/8/130874495/mixil.pdf
    • http://files.oldpostfarm.com/uploads/1/3/1/3/131378921/wokixopisoxufu_vexadev_soresek.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/6411/2805/files/25289074429.pdf
    • https://cdn.shopify.com/s/files/1/0433/4741/1096/files/94821749007.pdf
    • https://cdn.shopify.com/s/files/1/0431/7508/4193/files/hapkido_techniques.pdf
    • https://cdn.shopify.com/s/files/1/0430/7720/6165/files/povagifepakizawa.pdf
    • https://cdn.shopify.com/s/files/1/0428/2312/3100/files/bizujijetoxadiv.pdf
    • https://cdn.shopify.com/s/files/1/0433/3328/8088/files/woburatupatuvunefilup.pdf
    • https://cdn.shopify.com/s/files/1/0445/8423/9268/files/itu_r_bt._709_5.pdf
    • https://cdn.shopify.com/s/files/1/0438/6881/5528/files/mugen_family_guy.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/99640144283.pdf
    • https://cdn.shopify.com/s/files/1/0435/3438/5303/files/playboy_magazines_collectors.pdf
    • https://cdn.shopify.com/s/files/1/0429/6913/7305/files/visio_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0429/9161/6153/files/nilerisewiwanoseleliwuko.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005746.bin
9e2e2d5a704bd59760bb453dfef89bc355b177b4599908b104ca79ac4ca8a1eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5746 5816 bytes
font_01_sfnt_off00006b1b.bin
51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B1B 1800 bytes
font_02_sfnt_off000073a8.bin
d1df8ec985d9b96177ae4d3ebb4269c5225d037b88947c8b58cdbf92929abfda		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73A8 9964 bytes

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