Malicious PDF — malware analysis report

Static analysis result for SHA-256 f82479e19e2e6a6e…

MALICIOUS

PDF

53.8 KB Created: 2020-08-19 21:37:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8a7259bcfc27b21269e1a9c390ccf6c SHA-1: 81792d211452e295410cd2cb22190a26f470bca3 SHA-256: f82479e19e2e6a6e46783a191c73381551de9fe671167e1ecf2f4e5be2558155
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure. The document body, though obfuscated, includes the URL 'https://ttraff.ru/pify?keyword=evaluation+transformation+physique+et+chimique+5eme', which is also flagged as malicious. The presence of numerous other PDF links, many pointing to unknown domains, suggests a link farm designed to obscure the ultimate destination and potentially distribute further malicious content.

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=evaluation+transformation+physique+et+chimique+5eme
    • http://memapa.nelsonendeavorsllc.com/uploads/1/3/1/3/131380005/699938f79a2a2ce.pdf
    • http://files.stepsinbiology.com/uploads/1/3/0/8/130874475/livefufexe-nuteperego.pdf
    • http://files.judithviskerart.com/uploads/1/3/0/7/130739021/b1c60ebf8a7319e.pdf
    • http://files.emeraldmanagers.com/uploads/1/3/1/4/131408024/vimadixal.pdf
    • http://kipakik.citysunholdings.com/uploads/1/3/0/7/130776855/3173d7e7d3.pdf
    • https://cdn.shopify.com/s/files/1/0434/4777/9478/files/5697034045.pdf
    • https://cdn.shopify.com/s/files/1/0447/1242/7674/files/google_classroom_for_parents.pdf
    • https://cdn.shopify.com/s/files/1/0438/5685/5190/files/berserk_manga_mega.pdf
    • https://cdn.shopify.com/s/files/1/0431/1918/1985/files/49486816333.pdf
    • https://cdn.shopify.com/s/files/1/0429/9010/8833/files/puketopinaduwipoxizet.pdf
    • https://cdn.shopify.com/s/files/1/0430/2897/1681/files/pewijesimo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8117/9037/files/23207134664.pdf
    • https://cdn.shopify.com/s/files/1/0437/3191/0821/files/windows_10_linux_subsystem.pdf
    • https://cdn.shopify.com/s/files/1/0438/6793/0789/files/applied_mathematics_for_business_economics_and_the_social_sciences.pdf
    • https://cdn.shopify.com/s/files/1/0434/0000/3749/files/zogafi.pdf
    • https://cdn.shopify.com/s/files/1/0435/5856/8097/files/3961198086.pdf
    • https://cdn.shopify.com/s/files/1/0438/9437/4555/files/business_english_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8861538602.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008573.bin
d2e96aa9d2fb4583cbbde9c3a246d06d1ea675c3b7f03a2f2607f183a678cf86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8573 5508 bytes
font_01_sfnt_off00009816.bin
35135a1816fa5b9310fc4d0dc4fb22609a16d37ec048de55698a8232a6efa5c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9816 10316 bytes
font_02_sfnt_off0000bb3f.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB3F 4324 bytes

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