Malicious PDF — malware analysis report

Static analysis result for SHA-256 788d9f922f2a4da3…

MALICIOUS

PDF

48.0 KB Created: 2020-08-21 08:01:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9856404d7cac035c77430f05cce7b7f3 SHA-1: c15dfd8f8b2f03c952382de0021c81737c7e9c28 SHA-256: 788d9f922f2a4da341872eb44aeed562c90ddfe4178699619428c9041d91459b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to potentially malicious redirector infrastructure. The heuristic PDF_SEO_LINK_FARM indicates a link farm, and PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a known malicious redirector. The document body, though partially corrupted, contains the URL https://ttraff.cc/pify?keyword=waterfall+butterfly+live+wallpaper+for+android, which is also flagged as malicious. This suggests the document is designed to lead users to malicious sites, 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=waterfall+butterfly+live+wallpaper+for+android
    • http://nimor.marmiger.com/uploads/1/3/1/3/131398589/janozaxegisozulelari.pdf
    • http://files.lastminutevacationdeals.ca/uploads/1/3/0/8/130814666/demeloledebe_wodidabi_rovalekowesi_numomivuz.pdf
    • http://faxixab.kolavrohomkids.com/uploads/1/3/0/7/130776824/muvule.pdf
    • http://files.blendnutritionco.com/uploads/1/3/0/9/130969461/dasutoduwe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/8418/4742/files/b1_english_reading_books.pdf
    • https://cdn.shopify.com/s/files/1/0427/7462/6470/files/tipowikagikijotofaruzu.pdf
    • https://cdn.shopify.com/s/files/1/0433/5858/4986/files/namakam_chamakam_in_kannada.pdf
    • https://cdn.shopify.com/s/files/1/0435/9792/2461/files/past_participle_irregular_verbs_list.pdf
    • https://cdn.shopify.com/s/files/1/0435/7927/7467/files/raxinopenefegedisomo.pdf
    • https://cdn.shopify.com/s/files/1/0439/9503/7854/files/jojoku.pdf
    • https://cdn.shopify.com/s/files/1/0430/7091/4717/files/venunasajoxerovesabidar.pdf
    • https://cdn.shopify.com/s/files/1/0434/1393/0142/files/venukikobigasevopot.pdf
    • https://cdn.shopify.com/s/files/1/0429/9646/5823/files/kasaxitozolutilazu.pdf
    • https://cdn.shopify.com/s/files/1/0430/4555/2290/files/50419821330.pdf
    • https://cdn.shopify.com/s/files/1/0430/1130/9719/files/pokowokimivutiv.pdf
    • https://cdn.shopify.com/s/files/1/0437/6467/8807/files/bidopigufowevokoloxime.pdf
    • https://cdn.shopify.com/s/files/1/0436/1689/5133/files/d_shackle_sizes_and_capacity.pdf
    • https://cdn.shopify.com/s/files/1/0432/8590/5576/files/english_grammar_book_grade_3.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007dec.bin
f9e7dd81136af5fd853726bb9195cf9f5ba1332d8b145c6b8b5a90fa8d020c01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DEC 5264 bytes
font_01_sfnt_off00008ffb.bin
1c8ba1c7e5ec96fc902e669b202b55ada2fb39c9f1c1d818a35070b95b2884f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FFB 10060 bytes

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