Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa16dc1dbcc9f804…

MALICIOUS

PDF

72.2 KB Created: 2020-08-02 18:16:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 175cd63e6ec0cc46a2da993bb090b6ca SHA-1: d63c0a0078a09651d6a6e0eb810680d2396df565 SHA-256: fa16dc1dbcc9f804d26a915c2b08c3688f2b96fcb4150e1a607658b18179223a
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, many pointing to Shopify domains hosting PDF files, characteristic of a link farm or SEO manipulation tactic. One critical heuristic identified a link to a known malicious redirector at 'ttraff.com'. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves leveraging these links for redirection or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.com/pify?keyword=d%2526+d+advantage
    • http://files.andrewdpaterson.com/uploads/1/3/1/4/131407194/d9577836a4144.pdf
    • http://files.kikinaart.com/uploads/1/3/0/7/130739678/8637975.pdf
    • http://files.chyarber.com/uploads/1/3/1/3/131380345/viwaz_wepitevenu_pesimazeko_sujeratuxujo.pdf
    • http://files.riverdining.com/uploads/1/3/0/8/130873921/2071246.pdf
    • https://cdn.shopify.com/s/files/1/0430/9119/8112/files/fafaxisanejasa.pdf
    • https://cdn.shopify.com/s/files/1/0435/2563/6248/files/sazugewe.pdf
    • https://cdn.shopify.com/s/files/1/0431/1557/7504/files/24800081416.pdf
    • https://cdn.shopify.com/s/files/1/0434/3057/6285/files/25425518221.pdf
    • https://cdn.shopify.com/s/files/1/0430/8402/1921/files/22994917015.pdf
    • https://cdn.shopify.com/s/files/1/0431/7341/3028/files/80964756273.pdf
    • https://cdn.shopify.com/s/files/1/0435/9523/5490/files/24925005459.pdf
    • https://cdn.shopify.com/s/files/1/0430/9575/2858/files/437620690.pdf
    • https://cdn.shopify.com/s/files/1/0435/4693/5445/files/lugifepenisuwu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9565/4554/files/wunezifibetus.pdf
    • https://cdn.shopify.com/s/files/1/0430/8231/7975/files/28028061161.pdf
    • https://cdn.shopify.com/s/files/1/0432/9370/4356/files/metuzudipurerepav.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 8

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d91.bin
ca04e449099fdb12f533cbe3aee958cd2f92c8fc415ac9f12455e8bae2d068a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D91 6596 bytes
font_01_sfnt_off00007dd5.bin
9cb16e24caae0cda5f696f8515c9caf552c5cb8182508cb5a6b41535a3d08d09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DD5 3148 bytes
font_02_sfnt_off00008914.bin
b6bc3e761eca8ae26333d0367913862b9788f7109bed8a3dd2635371d897bba1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8914 3484 bytes
font_03_sfnt_off00009440.bin
c26dc82625040ed36ef2fd348a4ffae9b2dee68d5c26c2583571c76de9514605		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9440 6224 bytes
font_04_sfnt_off0000a363.bin
45132e4f98201c4dbd40be4a246671887245d42d29e0ad67dc34427003e6c1f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA363 20832 bytes
font_05_sfnt_off0000df89.bin
5efd9462f284ef7277d87fd24bdf7a741e18c1819bc00743f2f8253b8c1f1185		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF89 16304 bytes
font_06_sfnt_off0000f54c.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF54C 4324 bytes
font_07_sfnt_off0001030d.bin
e7a858197947eb87431d2039bc3952700c31b69ba9da853a89e697eab2803a73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1030D 6096 bytes

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