Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd8c3161c27566c7…

MALICIOUS

PDF

48.6 KB Created: 2020-08-03 11:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d63c3053f7d07dbe744c68cb9cec3a0d SHA-1: 2ea75598249b445478d07867f61047b811e2c7b8 SHA-256: fd8c3161c27566c7d84918ebf2a3a84cb7b702dd3f53c5dc0ae6b703ec3d85c0
152 Risk Score

Malware Insights

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

The PDF contains a lure for a free anatomy atlas, but the embedded link redirects to a known malicious redirector. The PDF also features a large number of external links, many hosted on Shopify, suggesting a link farm for SEO manipulation to distribute malicious content. The ML classifier strongly indicated maliciousness.

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=atlas+anatomie+humaine+pdf+gratuit
    • http://noguze.emilylapann.com/uploads/1/3/2/6/132682090/vosix_vudovo.pdf
    • http://files.psbproservices.com/uploads/1/3/2/6/132695531/7dca1e.pdf
    • http://files.intuitivereadings.com/uploads/1/3/0/7/130776054/3152086.pdf
    • http://files.frontrunnerbooks.com/uploads/1/3/2/6/132681880/sebudubopipi.pdf
    • https://cdn.shopify.com/s/files/1/0431/1236/6229/files/semibufil.pdf
    • https://cdn.shopify.com/s/files/1/0431/1960/7962/files/9126354240.pdf
    • https://cdn.shopify.com/s/files/1/0428/8030/3270/files/nomujesajosubuwerurag.pdf
    • https://cdn.shopify.com/s/files/1/0437/0386/1401/files/18374284877.pdf
    • https://cdn.shopify.com/s/files/1/0428/0729/6163/files/42544781522.pdf
    • https://cdn.shopify.com/s/files/1/0430/5797/1354/files/kosasukujogofuvosot.pdf
    • https://cdn.shopify.com/s/files/1/0433/4721/4486/files/luveditupixazemevila.pdf
    • https://cdn.shopify.com/s/files/1/0430/1327/5811/files/risk_management_principles_and_guidelines_iso_31000.pdf
    • https://cdn.shopify.com/s/files/1/0437/6972/5080/files/org._apache._spark._sparkexception_task_not_serializable.pdf
    • https://cdn.shopify.com/s/files/1/0431/8851/9076/files/51938751632.pdf
    • https://cdn.shopify.com/s/files/1/0430/6881/7569/files/13866114848.pdf
    • https://cdn.shopify.com/s/files/1/0431/7069/3284/files/mikod.pdf
    • https://cdn.shopify.com/s/files/1/0429/9181/2767/files/83401456794.pdf
    • https://cdn.shopify.com/s/files/1/0433/3672/8726/files/pajilular.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_off000065a5.bin
ecc8edcc177e21281dddaad08c186a4064c4d08cbb60203bb92bdd64d3b36e87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65A5 5444 bytes
font_01_sfnt_off00007801.bin
d9797454a80ae30ec2c430d75b951fdd465bfb5d04de7092331e9199495457da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7801 12020 bytes
font_02_sfnt_off00009e65.bin
bcfecb9fde4b74e4a2b692e15caf305b2988a1cfe4c6386614002e38d35feb86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E65 16168 bytes

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