Malicious PDF — malware analysis report

Static analysis result for SHA-256 3347626caa3f31d8…

MALICIOUS

PDF

41.3 KB Created: 2020-08-25 04:44:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e274c0c787cdbf39b1725aafff927d0a SHA-1: 7b514bdceb7e848eb52a4e03959a7d4cf59f2aeb SHA-256: 3347626caa3f31d805113fcfdb6dcfc8264d89aebe21b4f38fc6fb98dc925baa
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to ttraff.ru. The document body, though heavily obfuscated, contains the URL and text related to an 'appointment reschedule email template', suggesting a social engineering lure. The presence of numerous external PDF links, many hosted on Shopify, further indicates a link farm designed to obscure the malicious redirector.

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.ru/pify?keyword=appointment+reschedule+email+template
    • http://files.alexisunderwoodarts.com/uploads/1/3/2/6/132681885/36fed6.pdf
    • http://files.buckhamgallery.org/uploads/1/3/1/4/131406386/mutatilaforijel_zulazafitigif_zuweb_tiwut.pdf
    • http://fofiwo.mymodernsolutions.ca/uploads/1/3/1/4/131438500/1206732.pdf
    • http://dilem.speedcitysistersincrime.org/uploads/1/3/1/4/131408027/fizezomovob.pdf
    • https://cdn.shopify.com/s/files/1/0430/9424/5525/files/gw2_skyscale_medicine_collection_guide.pdf
    • https://cdn.shopify.com/s/files/1/0437/7850/6909/files/android_java_checkbox_checked.pdf
    • https://cdn.shopify.com/s/files/1/0437/4121/6917/files/bahubali_songs_isaimini.pdf
    • https://cdn.shopify.com/s/files/1/0432/2571/0756/files/35318069853.pdf
    • https://cdn.shopify.com/s/files/1/0448/3235/8560/files/let_learn_english_book_1.pdf
    • https://cdn.shopify.com/s/files/1/0432/9721/0532/files/89825502222.pdf
    • https://cdn.shopify.com/s/files/1/0435/2350/6336/files/jiwividaz.pdf
    • https://cdn.shopify.com/s/files/1/0432/1509/3917/files/ceramic_materials_processing_properties_and_applications.pdf
    • https://cdn.shopify.com/s/files/1/0429/1097/4111/files/36941491544.pdf
    • https://cdn.shopify.com/s/files/1/0432/4048/9122/files/accounting_standard_11.pdf
    • https://cdn.shopify.com/s/files/1/0431/9772/6880/files/betty_crocker_recipe_book.pdf
    • https://cdn.shopify.com/s/files/1/0430/1501/2511/files/where_are_dividends_paid_on_balance_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/0710/6462/files/tavazotakekivekokonuval.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_off000062ba.bin
72e2a9c639cb154924762d0eb31c32ae9ccf6d0c5b45da201786e4064c7d4043		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62BA 5300 bytes
font_01_sfnt_off00007485.bin
7ccdddea272610ecb197bb7ddef5bcd33a69e63f03aff7124f72440fe4d20caa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7485 10456 bytes

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