Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6cc03c044d63fa3…

MALICIOUS

PDF

68.6 KB Created: 2020-08-22 01:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 097a2fb8ce3c1775be555120704afb16 SHA-1: 854f872a98b8592779e9704bd165c25280b15ec4 SHA-256: b6cc03c044d63fa3de5895be9ab2cdf57cd28ea511ed452267eb9a7613e391ee
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of these links, https://ttraff.cc/pify?keyword=true+caller+name+id, is identified as a known malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users to malicious content. The ML classifier strongly flagged this PDF as malicious.

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=true+caller+name+id
    • http://files.anthonyscafebistro.com/uploads/1/3/1/6/131606502/0604eb382268dfa.pdf
    • http://files.elizabethstaiger.com/uploads/1/3/2/8/132815866/5404855.pdf
    • https://cdn.shopify.com/s/files/1/0432/5598/8374/files/63845172999.pdf
    • https://cdn.shopify.com/s/files/1/0430/9378/6791/files/types_of_communication_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/9966/7099/files/timozolikuz.pdf
    • https://cdn.shopify.com/s/files/1/0435/4693/5447/files/xapokededu.pdf
    • https://cdn.shopify.com/s/files/1/0441/0405/6984/files/xekasarorowas.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38030937597.pdf
    • https://cdn.shopify.com/s/files/1/0433/6805/4949/files/xogolitifegutagutufuj.pdf
    • https://cdn.shopify.com/s/files/1/0452/1361/4240/files/a_week_in_the_woods_full_book.pdf
    • https://cdn.shopify.com/s/files/1/0433/7077/4693/files/33394608637.pdf
    • https://cdn.shopify.com/s/files/1/0433/5055/6821/files/purozu.pdf
    • https://cdn.shopify.com/s/files/1/0430/5505/5002/files/61680088242.pdf
    • https://cdn.shopify.com/s/files/1/0434/3513/1036/files/laboratory_equipment_list_with_pictures.pdf
    • https://cdn.shopify.com/s/files/1/0434/7897/4616/files/34218101708.pdf
    • https://cdn.shopify.com/s/files/1/0434/2513/6792/files/barbie_rapunzel_music.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000eb40.bin
7933de6d7a5d6d48a84d8b604d3e2d3b2270e68411d848d8b432e2b8c5384c38		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xEB40 17296 bytes
font_00_sfnt_off000073c8.bin
8601f0afbb1305be160abc677fcbc2eab108a0972c61dbe528363a5e6c2744a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73C8 21588 bytes
font_01_sfnt_off0000b7c9.bin
95406796978d1293137994fd1e9aad960dfd047bbba3ff492a3c18119028734e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB7C9 4856 bytes
font_02_sfnt_off0000c82c.bin
53049e6fb3f5aa663b68b9ecf9f4b8d2c4e232ac5bce96c6cd28b530a53a2e40		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC82C 10168 bytes

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