Malicious PDF — malware analysis report

Static analysis result for SHA-256 b040e29af86e2a43…

MALICIOUS

PDF

43.8 KB Created: 2020-08-07 08:30:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f4f4b20a38f90a6f766d8d25fa83b74 SHA-1: f614dc01a72afbe38d2e4711073a6ef864dccbef SHA-256: b040e29af86e2a43039e96af124b611522d64069b1a72130969f7db2beb50e21
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to domains commonly used in SEO link farms. One of these links, https://ttraff.ru/pify?keyword=protein+structure+primary+secondary+tertiary+and+quaternary+pdf, is identified as a known malicious redirector. The ML classifier strongly indicates maliciousness. The document body itself is heavily obfuscated but contains references to the malicious URL and other PDF links.

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=protein+structure+primary+secondary+tertiary+and+quaternary+pdf
    • http://files.socialtheorywatch.org/uploads/1/3/1/6/131606248/1003437.pdf
    • http://files.familylavisse.com/uploads/1/3/0/7/130776451/gutapemaroz.pdf
    • http://files.countyparkfriends.org/uploads/1/3/0/8/130814279/zobisulit_selitiga_sojinotavom.pdf
    • http://files.trattoria89.com/uploads/1/3/1/3/131379085/1387542.pdf
    • http://files.benbrixey.com/uploads/1/3/0/7/130739686/metezo_ruwubebupiv_nofajosumino_paxilire.pdf
    • https://cdn.shopify.com/s/files/1/0432/1820/6887/files/vibadijezejudajori.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/temufaxilagig.pdf
    • https://cdn.shopify.com/s/files/1/0449/9347/8814/files/qasida_burda_arabic.pdf
    • https://cdn.shopify.com/s/files/1/0438/0177/2192/files/terraria_black_lens.pdf
    • https://cdn.shopify.com/s/files/1/0429/9092/8026/files/rudevanenegobukojinuv.pdf
    • https://cdn.shopify.com/s/files/1/0434/2064/7576/files/tigutol.pdf
    • https://cdn.shopify.com/s/files/1/0431/5663/5812/files/vomowu.pdf
    • https://cdn.shopify.com/s/files/1/0434/4869/6993/files/it_wasnt_me_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0429/7955/7539/files/74225474364.pdf
    • https://cdn.shopify.com/s/files/1/0435/4693/5451/files/atal_pension_yojana_details_in_marathi.pdf
    • https://cdn.shopify.com/s/files/1/0432/0883/5236/files/zifuxigikeretigo.pdf
    • https://cdn.shopify.com/s/files/1/0431/3192/8730/files/zedakulorobowenubaj.pdf
    • https://cdn.shopify.com/s/files/1/0428/7276/6630/files/fuvosowezavakokanazij.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_off00006d74.bin
48195b582363228fb9e1a908932d80969283a99b89d1127b0bb8a61f9ced4264		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D74 5500 bytes
font_01_sfnt_off0000801c.bin
e693361e4c622a67a4b8613e8fe5f2f3692c7d92c95cf7e18a0a2ad148f1f54d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x801C 9728 bytes

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