Malicious PDF — malware analysis report

Static analysis result for SHA-256 02442a4295c1af4a…

MALICIOUS

PDF

45.0 KB Created: 2020-08-31 17:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c581f0fce38e4d15436a4e41a5efd995 SHA-1: f3b9bf30a0d28cdb6c7ce7520802d24cb9a4e92a SHA-256: 02442a4295c1af4a760fdb194b2eb467f2452a833bde50ba9ecc913460b4fc02
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains this URL and numerous other links, many of which are benign but contribute to a link farm. The ML classifier also strongly flagged this PDF as malicious. The primary IOC is the malicious redirector URL, which is likely used to lure users into a phishing or malware download site.

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=xiaomi+airdots+user+manual+english
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/21a131_bc0096692820427db62081cc428ac9f0.pdf
    • https://static.usrfiles.com/ugd/7ef0dc_f2b7ff1b7ec14916b34f439607c79861.pdf
    • https://static.usrfiles.com/ugd/b8c837_9616aa18dc914bb6bb01111b6d486959.pdf
    • https://cdn.shopify.com/s/files/1/0435/4077/5071/files/bubble_answer_sheet_1-_25.pdf
    • https://cdn.shopify.com/s/files/1/0437/3997/1738/files/all_in_one_accountancy_class_12_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/6418/0390/files/75448212957.pdf
    • https://cdn.shopify.com/s/files/1/0429/5966/7363/files/iis_url_rewrite.pdf
    • https://cdn.shopify.com/s/files/1/0462/5278/5813/files/avoid_verb_forms.pdf
    • https://static.usrfiles.com/ugd/432b07_76d16c3819da4bcca1abd09411102f33.pdf
    • https://static.usrfiles.com/ugd/e8506d_1f471240c9d34b2caed3a8006ce543fb.pdf
    • https://static.usrfiles.com/ugd/b42fd6_74f96b107dba40c09d3cb4972c27d97f.pdf
    • https://static.usrfiles.com/ugd/b8c837_407fb36b545b451db726156f0a55eebe.pdf
    • https://static.usrfiles.com/ugd/b8c837_cdc77f2aa0844d95be48d2cfbe874bbd.pdf
    • https://static.usrfiles.com/ugd/b8c837_953e6decbe2a445cbfe6efe51b00db57.pdf
    • https://static.usrfiles.com/ugd/a2e20a_fa7825d0f3ce4ccbacef921e94a4a1eb.pdf
    • https://static.usrfiles.com/ugd/9c43ec_b99e43a292ec41f0b4735d7e94f5b1ee.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006591.bin
81f14f15a012948a406a318edb9a3296f50c98131bf2a5b7d7706fa89c295a4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6591 5096 bytes
font_01_sfnt_off000076ab.bin
76c1fb6b03cae520b9718411fc5cfb82d4ae1f9feef3877d5d942394fa11b32d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76AB 10084 bytes
font_02_sfnt_off00009934.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9934 4324 bytes

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