Malicious PDF — malware analysis report

Static analysis result for SHA-256 4712f88c23c96eec…

MALICIOUS

PDF

46.2 KB Created: 2020-08-21 21:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7f4698a5071d41c13ef463207eca170 SHA-1: 0c3f0b3c8928669a47e13448f0ad1aacef744824 SHA-256: 4712f88c23c96eecea5c911efce5ddf40d05bb23f6df9c56cd16a2076fad995a
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is designed to send users to other malicious sites. The document also features a large number of external PDF links, many hosted on cdn.shopify.com, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the presence of the malicious redirector and the link farm strongly indicate a malicious intent to lure users to harmful content.

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=ascription+verb+form
    • http://jexomudit.syrinxfluteandharp.com/uploads/1/3/1/4/131406387/xiwirukatetifavuwe.pdf
    • http://files.maliadcl.com/uploads/1/3/2/3/132303286/datujotug.pdf
    • http://files.thewholechildmatters.com/uploads/1/3/1/3/131383657/6325289.pdf
    • http://mavoru.saukprairiehistory.org/uploads/1/3/1/4/131452883/seluvifirokiliki.pdf
    • https://cdn.shopify.com/s/files/1/0439/0020/7272/files/vezadaruz.pdf
    • https://cdn.shopify.com/s/files/1/0430/3932/6365/files/33624614064.pdf
    • https://cdn.shopify.com/s/files/1/0432/9370/4356/files/13697280293.pdf
    • https://cdn.shopify.com/s/files/1/0444/8750/8135/files/hedging_in_islamic_finance.pdf
    • https://cdn.shopify.com/s/files/1/0434/8834/6262/files/effect_of_alloying_elements.pdf
    • https://cdn.shopify.com/s/files/1/0429/8299/8170/files/steelhax_nintendo_3ds.pdf
    • https://cdn.shopify.com/s/files/1/0435/3386/1018/files/kaxavop.pdf
    • https://cdn.shopify.com/s/files/1/0432/1024/4256/files/13469596006.pdf
    • https://cdn.shopify.com/s/files/1/0430/0016/8597/files/danavuz.pdf
    • https://cdn.shopify.com/s/files/1/0433/8683/1004/files/66437366080.pdf
    • https://cdn.shopify.com/s/files/1/0434/1540/4695/files/arcore_by_google.pdf
    • https://cdn.shopify.com/s/files/1/0431/9812/0094/files/tolaz.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_off00006d10.bin
4302525c2ae284721ade6886b1a043dce94271d67ec41ed5ed9b4deba99f560c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D10 4896 bytes
font_01_sfnt_off00007d95.bin
6e124ec92da1aa7ba87287c1560f71f55622e3907a63bbb92ff61a031a7de4d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D95 9596 bytes
font_02_sfnt_off00009e4f.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E4F 4324 bytes

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