Malicious PDF — malware analysis report

Static analysis result for SHA-256 49863298642c5835…

MALICIOUS

PDF

37.9 KB Created: 2020-08-09 02:38:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19c70fcde189b30fd624cc32b5dec772 SHA-1: 4a39559cf364708877499f31017a591c3d96c343 SHA-256: 49863298642c5835b2a6d57f59eb5c029c3551089aae4899b3b864fb37a171e0
152 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to what appears to be a link farm hosted on Shopify. One critical heuristic firing indicates a direct link to a known malicious redirector infrastructure at 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL, reinforcing the intent to redirect the user. No scripts were extracted, but the primary attack vector is the malicious redirection.

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=plz+karte+baden+w%25C3%25BCrttemberg+pdf
    • http://files.appletreecontractors.com/uploads/1/3/1/6/131607712/9709263.pdf
    • http://files.aspergiannation.com/uploads/1/3/2/8/132816202/bonikisikofeme.pdf
    • http://wafegebe.re3institute.org/uploads/1/3/2/8/132814930/1357685.pdf
    • http://nefadaj.unisonwestberks.com/uploads/1/3/1/6/131637136/8413359.pdf
    • http://files.orderbrewtoledo.com/uploads/1/3/0/8/130813362/1111872.pdf
    • https://cdn.shopify.com/s/files/1/0429/0969/6156/files/development_administration_and_management.pdf
    • https://cdn.shopify.com/s/files/1/0430/4932/0610/files/50721103714.pdf
    • https://cdn.shopify.com/s/files/1/0430/3680/3233/files/40543236265.pdf
    • https://cdn.shopify.com/s/files/1/0431/5332/6242/files/wapabogasaxodexotezozor.pdf
    • https://cdn.shopify.com/s/files/1/0433/9492/4694/files/memojojikawemojanilaf.pdf
    • https://cdn.shopify.com/s/files/1/0433/1785/4373/files/zidekiwazijilikumob.pdf
    • https://cdn.shopify.com/s/files/1/0429/3633/6540/files/wavulusidirijaguguk.pdf
    • https://cdn.shopify.com/s/files/1/0429/0061/9423/files/53439170307.pdf
    • https://cdn.shopify.com/s/files/1/0430/8949/4177/files/98737672565.pdf
    • https://cdn.shopify.com/s/files/1/0433/3377/9611/files/methodical_illusion_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/1411/1903/files/72968915199.pdf
    • https://cdn.shopify.com/s/files/1/0428/5644/8156/files/jelosuxezena.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000528f.bin
30ae7988f77e83601222f6f4a63311e78ef984a71c5d640c0daa658df7875066		 pdf-font-stream PDF embedded font (sfnt) at offset 0x528F 5648 bytes
font_01_sfnt_off00006599.bin
eee87f7dac9ef6e4a9459983d77fab209d894c90f2914e69bed58af3fbfe2286		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6599 10772 bytes

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