Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac85c10def688ce6…

MALICIOUS

PDF

50.8 KB Created: 2020-08-04 10:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c1bc6504104205c1bdf36d1c5ea8c43 SHA-1: c13935fbc45b4f3224bab9e1baf3ee6393b4c2a2 SHA-256: ac85c10def688ce676db55bab26b0ec15628c9b3c1c7d628c1654d8d043594c0
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=que+son+las+bacterias+mesofilas+aerobias+pdf'. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to lure the user to this malicious site. The ML classifier strongly supports the malicious nature of this PDF.

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=que+son+las+bacterias+mesofilas+aerobias+pdf
    • http://jepiretow.treetopreptile.com/uploads/1/3/1/4/131407005/wubiretavezalirev.pdf
    • http://files.marysvillebands.org/uploads/1/3/2/6/132681452/natoxezebolizat.pdf
    • http://files.colaizzifitness.com/uploads/1/3/1/3/131384679/pitezadikak.pdf
    • http://xuwukis.secondsportswimming.com/uploads/1/3/0/9/130969742/5840248.pdf
    • https://cdn.shopify.com/s/files/1/0432/4183/2615/files/61316740558.pdf
    • https://cdn.shopify.com/s/files/1/0428/5428/5479/files/6713469803.pdf
    • https://cdn.shopify.com/s/files/1/0429/6169/8969/files/45859858442.pdf
    • https://cdn.shopify.com/s/files/1/0431/8763/4338/files/zewetewuvifelev.pdf
    • https://cdn.shopify.com/s/files/1/0432/9888/1704/files/28252892369.pdf
    • https://cdn.shopify.com/s/files/1/0428/8184/3356/files/kudomuwobamojifi.pdf
    • https://cdn.shopify.com/s/files/1/0430/8933/0330/files/29602032225.pdf
    • https://cdn.shopify.com/s/files/1/0434/0423/0805/files/10436745433.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/69865881622.pdf
    • https://cdn.shopify.com/s/files/1/0430/0885/2117/files/18838823873.pdf
    • https://cdn.shopify.com/s/files/1/0427/7318/4678/files/fufosewizutoravakeverox.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/17418425376.pdf
    • https://cdn.shopify.com/s/files/1/0432/8158/0188/files/xowopanivesebi.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_off0000871d.bin
3b6c56f239b78c8bb46c240dea417d1c85c4824897293f0edf42c785efe10a52
pdf-font-stream PDF embedded font (sfnt) at offset 0x871D 5504 bytes
font_01_sfnt_off000099b0.bin
4bcb6eaadfa1346fe7d9fdb0d6b1015d30bab698ba898012069fc3c2f62c1361
pdf-font-stream PDF embedded font (sfnt) at offset 0x99B0 11216 bytes