Malicious PDF — malware analysis report

Static analysis result for SHA-256 578de62cab71139f…

MALICIOUS

PDF

35.9 KB Created: 2020-08-10 15:58:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8481d2978bfe0738160030a540b8cd6 SHA-1: f07835c5f159f832d11df14ab8421f31cb485462 SHA-256: 578de62cab71139fa1050c18c27eb908803f7b04cc1fd63f67d40821067f95b5
152 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and contains a large number of embedded links, many of which point to a redirector service. The primary malicious link identified is https://ttraff.cc/wb?keyword=present%20simple%20and%20present%20continuous%20wh%20questions%20exercises%20pdf, which likely leads to a malicious payload. The document body itself is heavily obfuscated and contains corrupted text, but the presence of numerous links suggests a lure to external content.

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/wb?keyword=present%20simple%20and%20present%20continuous%20wh%20questions%20exercises%20pdf
    • http://files.hellenphotography.com/uploads/1/3/1/1/131163834/7456277.pdf
    • http://files.thedaveellis.com/uploads/1/3/2/6/132695932/5315098.pdf
    • http://files.crabbycitty.com/uploads/1/3/0/8/130874411/vatuxolukopu-wipajoni.pdf
    • http://files.floridalivesound.com/uploads/1/3/1/4/131406749/ffa3e396.pdf
    • http://files.epicfitcouple.com/uploads/1/3/2/6/132681887/874593.pdf
    • https://cdn.shopify.com/s/files/1/0428/2515/4716/files/lutesebozepos.pdf
    • https://cdn.shopify.com/s/files/1/0438/9945/3608/files/20055418305.pdf
    • https://cdn.shopify.com/s/files/1/0434/8418/4742/files/how_do_you_make_bookmarks_in.pdf
    • https://cdn.shopify.com/s/files/1/0438/2185/8973/files/28385262219.pdf
    • https://cdn.shopify.com/s/files/1/0434/5243/2537/files/87605661941.pdf
    • https://cdn.shopify.com/s/files/1/0437/5393/0901/files/xusatuwevojemifidibe.pdf
    • https://cdn.shopify.com/s/files/1/0438/6196/7013/files/43951727295.pdf
    • https://cdn.shopify.com/s/files/1/0439/2583/1835/files/78325837701.pdf
    • https://cdn.shopify.com/s/files/1/0437/1100/4821/files/hotel_california_guitar_chords.pdf
    • https://cdn.shopify.com/s/files/1/0435/1878/7743/files/gobivi.pdf
    • https://cdn.shopify.com/s/files/1/0439/0515/5224/files/36732158855.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/70945418412.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_off00004c88.bin
56ce367928420d78bbb8538ec84c20fcfbe2ab675e64c416900d7dceece204da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C88 5680 bytes
font_01_sfnt_off00005fb0.bin
4763443d2cf3c33fc6226438add48a5c7970903ddaf50369df234d809ad2e608		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FB0 10112 bytes

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