Malicious PDF — malware analysis report

Static analysis result for SHA-256 79fb20d626de067a…

MALICIOUS

PDF

35.6 KB Created: 2020-09-08 01:43:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6fdb4fe25f583c316a7ee58f1e72e045 SHA-1: 0f5fd9f6ef516d067a96f536110e45ef2b92009c SHA-256: 79fb20d626de067ad76e0e903603f11f1e64c929b74bd2e6e953eb3144c3d863
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous embedded links, with one specifically pointing to a malicious redirector. The document body, though heavily obfuscated, appears to contain text related to a 'Bafang mid drive 350w manual' and the malicious URL, suggesting a lure to trick users into clicking the link. The presence of a link farm and a malicious redirector indicates an attempt to drive traffic to potentially harmful 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.me/pify?keyword=bafang+mid+drive+350w+manual
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/e4ee87_e3eadff040ee40849be19376e450dcc5.pdf
    • https://static.usrfiles.com/ugd/34e21e_96bc25027c9244659bd99a78083ba45d.pdf
    • https://static.usrfiles.com/ugd/6d59ab_38506704fb8c486fbc2532f695abbc92.pdf
    • https://static.usrfiles.com/ugd/98857b_5771eee6d27347c3bab6c2320031b0df.pdf
    • https://static.usrfiles.com/ugd/0e2875_05edee39b69648248406d9587b34b5c7.pdf
    • https://static.usrfiles.com/ugd/38955b_a2fd91a749b946558a1e20abdaaa0155.pdf
    • https://static.usrfiles.com/ugd/b65acf_98a62dbdf3c34956aeb696674fd9f734.pdf
    • https://static.usrfiles.com/ugd/40b9e6_4c717928c8e14038ba741ec77e91bfa4.pdf
    • https://static.usrfiles.com/ugd/565485_b743515b27204121a8216f4f7caeb06b.pdf
    • https://static.usrfiles.com/ugd/cec570_9cdefc227ab24d408b30143258805889.pdf
    • https://static.usrfiles.com/ugd/739437_75098d72d7a540bfac0374c7cd5353bd.pdf
    • https://static.usrfiles.com/ugd/63022f_77de86c5a6ec4215a5bcbe3f7b9a7553.pdf
    • https://static.usrfiles.com/ugd/7b00a0_3d61cc02ef414ecc8b0d7828d9311295.pdf
    • https://static.usrfiles.com/ugd/b56239_9fafa3c64d5949149d6e342af7f13238.pdf
    • https://static.usrfiles.com/ugd/4329d7_d28efb310c97491aa739aafd343a121f.pdf
    • https://cdn.shopify.com/s/files/1/0433/6451/6005/files/fakavugola.pdf
    • https://cdn.shopify.com/s/files/1/0435/4244/6231/files/ashoka_tree_information_in_english.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004aca.bin
f78d6cab4b88f2aa9330271fc5d5b5d5684ef0741b3a6f03d738e3c8102e816d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4ACA 5680 bytes
font_01_sfnt_off00005e25.bin
98e8fa1eabde9fbd830e30598351a5782f0790750b9c44efcf2aad093b9ba4cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E25 10288 bytes

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