Malicious PDF — malware analysis report

Static analysis result for SHA-256 c00742905cae3b2f…

MALICIOUS

PDF

44.7 KB Created: 2020-08-08 22:00:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d629fbb3adbdfccb8617ce247c14152a SHA-1: 170027f28d1b777aa6a8d59ead508fbe3cf5e8aa SHA-256: c00742905cae3b2fd5b2712899a99f01e20825947d80501962a13fadd4113feb
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 a link farm hosted on Shopify. One of the primary links directs to a known malicious redirector at 'ttraff.ru'. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of malicious redirector links and a link farm designed to manipulate search engine results. The document body itself appears to be obfuscated or corrupted, but the presence of the URL 'https://ttraff.ru/pify?keyword=soluciones+practicas+bernardo+stamateas+pdf+gratis' suggests a lure related to finding free PDF books.

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=soluciones+practicas+bernardo+stamateas+pdf+gratis
    • http://files.greatwesternco.net/uploads/1/3/0/7/130739456/1782608.pdf
    • http://lamabifaj.authorcaseybell.com/uploads/1/3/0/8/130874330/46b931fc7f.pdf
    • http://files.olevelsciencetuition.com/uploads/1/3/0/8/130873810/pobuxiladebonajej.pdf
    • http://files.olyhp.com/uploads/1/3/1/3/131383514/7bc0da3eb0b.pdf
    • https://cdn.shopify.com/s/files/1/0433/5671/7207/files/rapujexewuzajumofokowita.pdf
    • https://cdn.shopify.com/s/files/1/0435/2075/3823/files/kevegudufatajerupoka.pdf
    • https://cdn.shopify.com/s/files/1/0428/8679/1334/files/photography_company_profile_sample.pdf
    • https://cdn.shopify.com/s/files/1/0439/1917/9931/files/8299327606.pdf
    • https://cdn.shopify.com/s/files/1/0433/6739/9575/files/modern_chemistry_textbook_holt.pdf
    • https://cdn.shopify.com/s/files/1/0429/9846/4661/files/tojojixiwu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7194/6398/files/nefiwu.pdf
    • https://cdn.shopify.com/s/files/1/0434/8480/7334/files/mathematical_modelling_examples.pdf
    • https://cdn.shopify.com/s/files/1/0433/9197/5580/files/85520221603.pdf
    • https://cdn.shopify.com/s/files/1/0437/4003/7271/files/ramovarob.pdf
    • https://cdn.shopify.com/s/files/1/0437/6854/5441/files/39310783329.pdf
    • https://cdn.shopify.com/s/files/1/0434/6868/5464/files/97723618054.pdf
    • https://cdn.shopify.com/s/files/1/0431/6135/4389/files/bekegulewadudarexujobo.pdf
    • https://cdn.shopify.com/s/files/1/0433/3761/3461/files/72745285179.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_off00005d81.bin
c41d516430c0cf367ea7897fd9964ed789327990db2a582aae3fb392a4726ecd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D81 5600 bytes
font_01_sfnt_off0000705d.bin
8dff77359a35933a91047cd0dcebfe6f757a482ce13ee4a81ff2143257d54e9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x705D 11936 bytes
font_02_sfnt_off00009749.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9749 4324 bytes

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