Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfc84da3fec773eb…

MALICIOUS

PDF

42.9 KB Created: 2020-08-12 18:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36b956b788c32c3e568b8c527f08749f SHA-1: 99b6df19acce1a7a18d414cdb7d12cf3d29a1b82 SHA-256: bfc84da3fec773eb8123dd1e228170e10cc63c4d1531e5310d14ba3349d4c7f9
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, constituting a link farm. One of these links directs to a known malicious redirector, indicating a phishing or malicious content delivery attempt. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body was heavily obfuscated, making it difficult to determine the exact lure.

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.cc/wb?keyword=ismp%20list%20of%20error%20prone%20abbreviations%20pdf
    • http://files.allriskinsmobile.com/uploads/1/3/2/7/132740628/masunubuzop.pdf
    • http://files.dysonhouselr.com/uploads/1/3/1/4/131407965/runafivaza.pdf
    • http://files.kelsey-harrison.com/uploads/1/3/1/3/131383698/f28d524439f07e.pdf
    • http://files.hardwickwinery.com/uploads/1/3/0/8/130813667/9232181.pdf
    • http://files.privatetourssanfrancisco.com/uploads/1/3/1/3/131384429/nomamodezenawi-wujidibimik.pdf
    • https://cdn.shopify.com/s/files/1/0427/9956/2911/files/mupijigokewezekigubalunad.pdf
    • https://cdn.shopify.com/s/files/1/0434/2431/7596/files/causes_of_employee_absenteeism.pdf
    • https://cdn.shopify.com/s/files/1/0445/2660/0351/files/minimalist_house_design.pdf
    • https://cdn.shopify.com/s/files/1/0433/8375/0821/files/zofatejeniduwa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vebamuwonodivori.pdf
    • https://cdn.shopify.com/s/files/1/0432/6231/2616/files/fegafovixovet.pdf
    • https://cdn.shopify.com/s/files/1/0431/1135/0439/files/nofodufaguti.pdf
    • https://cdn.shopify.com/s/files/1/0434/8664/2336/files/38715300280.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lekutaxawiwasutoxojopelor.pdf
    • https://cdn.shopify.com/s/files/1/0428/7945/1289/files/english_chinese_dictionary_pinyin.pdf
    • https://cdn.shopify.com/s/files/1/0428/9619/5737/files/82450619393.pdf
    • https://cdn.shopify.com/s/files/1/0429/8833/9354/files/62398939921.pdf
    • https://cdn.shopify.com/s/files/1/0433/9505/5777/files/duzegurodaxezakojilav.pdf
    • https://cdn.shopify.com/s/files/1/0430/3601/6803/files/sufuten.pdf
    • https://cdn.shopify.com/s/files/1/0428/4504/4892/files/gewimutowodowe.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/
    • https://cdn.shopify.com/s/files/1/0428/4504/4892/files/gew

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062f7.bin
08768ad5017945b77f3c54a762d3fb1fbded7451ae314648498ab1690cf2138b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62F7 5324 bytes
font_01_sfnt_off000074ef.bin
db8f85c743b4fb97b1cac098eebaef682d358c9f1906f5e609e7ec74772cdfff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74EF 13036 bytes

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