Malicious PDF — malware analysis report

Static analysis result for SHA-256 db49c438d1eb8961…

MALICIOUS

PDF

48.6 KB Created: 2020-08-05 18:13:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24b213a62d7b11c717564fdc936364b4 SHA-1: 37c0d81a09c76a8884f5ac7c91b0bd95d63b8e2f SHA-256: db49c438d1eb89614de480b9f00d5a753dce13dfddc000c2b0caef83a586ba1b
154 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a high number of embedded links, many of which lead to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=german+workbook+for+beginners+pdf', which is also present in the heuristics. This suggests the PDF is designed to lure users into clicking malicious links, likely for phishing or malware distribution.

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=german+workbook+for+beginners+pdf
    • http://files.cmcridgewater.org/uploads/1/3/1/3/131383404/1572221.pdf
    • http://files.medicarespecialist.com/uploads/1/3/0/7/130775033/jugefe-suvigizumekarur-remabogevowi-bilovuse.pdf
    • http://files.pennimanarchitects.com/uploads/1/3/2/6/132695663/58beccdb8.pdf
    • http://files.salsaon2school.com/uploads/1/3/0/7/130738652/leruw.pdf
    • http://files.spiritualself-inquiry.com/uploads/1/3/1/4/131453247/5241328.pdf
    • https://cdn.shopify.com/s/files/1/0431/0777/8717/files/26751352916.pdf
    • https://cdn.shopify.com/s/files/1/0431/8789/6480/files/capsicum_annuum_medicinal_uses.pdf
    • https://cdn.shopify.com/s/files/1/0431/1403/7409/files/77662203049.pdf
    • https://cdn.shopify.com/s/files/1/0432/4445/4056/files/85244466875.pdf
    • https://cdn.shopify.com/s/files/1/0430/0803/2922/files/65780107350.pdf
    • https://cdn.shopify.com/s/files/1/0428/5038/6086/files/52761533815.pdf
    • https://cdn.shopify.com/s/files/1/0433/4823/0297/files/24130600992.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nexunalazuzifoginiwaboliz.pdf
    • https://cdn.shopify.com/s/files/1/0429/3014/3395/files/jiteparujawumoba.pdf
    • https://cdn.shopify.com/s/files/1/0433/7798/3653/files/13705490845.pdf
    • https://cdn.shopify.com/s/files/1/0433/0940/0214/files/sukorutuja.pdf
    • https://cdn.shopify.com/s/files/1/0433/4669/0203/files/stihl_fs45_prices.pdf
    • https://cdn.shopify.com/s/files/1/0435/5319/4133/files/management_of_peptic_ulcer_disease.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_off00007e6c.bin
67a6dbd78fea574f3083d1d658a0095e6ef47ee0c29aeaaaf3f6ea836a9b002b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E6C 5656 bytes
font_01_sfnt_off000091a3.bin
f2decd5061a0fe6b59ca620c3a9c0e6035e5932141edde104b3e35852f5aaa2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91A3 10504 bytes

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