Malicious PDF — malware analysis report

Static analysis result for SHA-256 588b01488ca835a8…

MALICIOUS

PDF

73.2 KB Created: 2020-07-30 22:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1e74cac80adb82af2864460483b3032 SHA-1: b7840b53aa411f70dd07d6ae7909e3cacb21c3c2 SHA-256: 588b01488ca835a8866e88209614fcc94ed53f2b3b64607ae2926288345ee8c6
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains text related to 'quartz pdfcontext mac download', suggesting a lure for software or a related service. The primary attack pattern involves redirecting users to malicious infrastructure via a link farm.

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=quartz+pdfcontext+mac+download
    • http://files.lifted-queens.com/uploads/1/3/1/8/131856195/2817029.pdf
    • http://files.enseaadvisory.com/uploads/1/3/0/7/130775402/3b39e35c8c2e64.pdf
    • http://files.davero.ca/uploads/1/3/1/4/131414134/genex_laditu_doviroxadek_rutujidovale.pdf
    • https://cdn.shopify.com/s/files/1/0430/0944/1953/files/bikogupixusumaze.pdf
    • https://cdn.shopify.com/s/files/1/0437/7536/1178/files/72210268074.pdf
    • https://cdn.shopify.com/s/files/1/0439/5565/0718/files/14485327907.pdf
    • https://cdn.shopify.com/s/files/1/0434/8080/9625/files/15912696290.pdf
    • https://cdn.shopify.com/s/files/1/0434/3690/0504/files/voragefadupiwo.pdf
    • https://cdn.shopify.com/s/files/1/0440/5955/8053/files/44936767636.pdf
    • https://cdn.shopify.com/s/files/1/0428/8030/3270/files/66015701437.pdf
    • https://cdn.shopify.com/s/files/1/0429/3387/8940/files/zalewasizi.pdf
    • https://cdn.shopify.com/s/files/1/0429/8054/0575/files/defulavometadipom.pdf
    • https://cdn.shopify.com/s/files/1/0435/5879/7471/files/dogumusiro.pdf
    • https://cdn.shopify.com/s/files/1/0431/6450/0122/files/38104304238.pdf
    • https://cdn.shopify.com/s/files/1/0432/2990/5058/files/65344200330.pdf
    • https://cdn.shopify.com/s/files/1/0428/6667/1782/files/25332438063.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/
    • https://cdn.shopify.com/s/fil

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a855.bin
faa122f881734f1b40eec05a82834f66015a97c309aa68243a8c60caa0729fdc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA855 7616 bytes
font_01_sfnt_off0000c1ee.bin
291275f7531143ab881dff8f491edb5be81b96ed7415c3d7ca15a749e20a9402		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC1EE 5228 bytes
font_02_sfnt_off0000d3bf.bin
e56c65d4ca9bb82fdb66a2a669f6ffd9e04bcd64e4802822780e2402421661a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BF 15288 bytes
font_03_sfnt_off00010296.bin
149cab45689013e99d1aa520d2e5234663aa5d8577b6aae5e423b5d60aeda4c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10296 16036 bytes

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