Malicious PDF — malware analysis report

Static analysis result for SHA-256 31eb27d2674659a2…

MALICIOUS

PDF

106.4 KB Created: 2020-08-04 17:05:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5235c58753993e3e2d27c142f90f3d5 SHA-1: 186b5e92459a97ee2ddefa01a2bb1cc26ce3ffb2 SHA-256: 31eb27d2674659a2c57ea8ebb9a0ac4f42dd4b6f989392b0c0d830b20d9792bc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The ML classifier also strongly indicated maliciousness. The PDF appears to be part of a link farm designed to drive traffic 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.com/pify?keyword=writing+academic+english+fourth+edition+pdf
    • http://files.donnawhitebooks.com/uploads/1/3/0/7/130738614/71c238a339820e2.pdf
    • http://files.debbies-prayer.com/uploads/1/3/0/7/130775557/zolama.pdf
    • http://files.onelinerjokelab.com/uploads/1/3/1/3/131381411/gosenewoxo_ketegakeses.pdf
    • http://files.music.olswahiawa.org/uploads/1/3/0/7/130775592/e52c7.pdf
    • http://files.szechuanhouseprinceton.com/uploads/1/3/1/4/131437453/mifopu_liguw.pdf
    • https://cdn.shopify.com/s/files/1/0433/9639/9265/files/77502224500.pdf
    • https://cdn.shopify.com/s/files/1/0431/5889/6802/files/mefawo.pdf
    • https://cdn.shopify.com/s/files/1/0437/7644/2519/files/suzesanufap.pdf
    • https://cdn.shopify.com/s/files/1/0433/6343/4654/files/tarumeretijibineradag.pdf
    • https://cdn.shopify.com/s/files/1/0429/9263/1962/files/19167570294.pdf
    • https://cdn.shopify.com/s/files/1/0431/1279/2221/files/electric_circuits_10th_edition_nilsson.pdf
    • https://cdn.shopify.com/s/files/1/0434/5489/0149/files/tobadewuvorejavegoziku.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/49893706483.pdf
    • https://cdn.shopify.com/s/files/1/0433/8958/3514/files/11634820743.pdf
    • https://cdn.shopify.com/s/files/1/0435/3890/7288/files/27488338232.pdf
    • https://cdn.shopify.com/s/files/1/0434/0681/9477/files/lujasemikizijezoga.pdf
    • https://cdn.shopify.com/s/files/1/0432/1175/1579/files/4185965852.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/
    • https://cdn.shopify.com/s/files/1/0429/9263/1962/files/1916757029

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014337.bin
8fded8c6b827716b31ce547fd65a3cb156753f8e30d8a2b9582f31a778d05d60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14337 5580 bytes
font_01_sfnt_off0001560f.bin
53c1513fcf65c71ba3da4027638d127189f7c28c434907ea2fcbdc09ec5e8cde		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1560F 11668 bytes
font_02_sfnt_off00017634.bin
542531352fabca3c5478cca1409918b1f3d26d7c0e443a9ba40f5d9733cda776		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17634 10868 bytes

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