Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa0db0328ee87c38…

MALICIOUS

PDF

48.5 KB Created: 2020-08-13 20:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8f23b44caa537d4300a4b32c37b792b SHA-1: 34bf46ad5ee8d06471f5946e4359da2d5d1710c3 SHA-256: aa0db0328ee87c38bb0a6ce8f60f2732328b3ba98bff6cbe2dd305f7e0a7a339
152 Risk Score

Malware Insights

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

The PDF document was flagged by a critical heuristic for linking to known malicious redirector infrastructure. Additionally, it contains a large number of external PDF links, many hosted on Shopify, suggesting a link farm or SEO poisoning attempt. The primary malicious URL identified is https://ttraff.com/pify?keyword=msds+nacl+merck+pdf, which is a known malicious redirector. The document body contains obfuscated text and embedded URLs, further supporting the malicious intent.

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.com/pify?keyword=msds+nacl+merck+pdf
    • http://daposewo.alliancetoheal.com/uploads/1/3/2/8/132814930/cec618.pdf
    • http://vajosowor.eventinspire.com/uploads/1/3/1/4/131453574/kulopogubowitu.pdf
    • http://wokeb.yakkemapparel.com/uploads/1/3/1/6/131637814/1661477.pdf
    • http://fulujemaw.abbasgrotto.com/uploads/1/3/2/6/132681333/79a3a417e967f0.pdf
    • https://cdn.shopify.com/s/files/1/0427/7954/1671/files/libros_de_instrumentacion_quirurgica_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0438/2726/5693/files/kuzexujugidog.pdf
    • https://cdn.shopify.com/s/files/1/0431/2272/0922/files/tajigibonawozidako.pdf
    • https://cdn.shopify.com/s/files/1/0437/8699/3813/files/tnpsc_answer_key_group_4_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0427/8432/5798/files/95692708985.pdf
    • https://cdn.shopify.com/s/files/1/0431/7659/1509/files/baremuxab.pdf
    • https://cdn.shopify.com/s/files/1/0435/2930/6263/files/zobuvavavinomizeve.pdf
    • https://cdn.shopify.com/s/files/1/0433/1008/8360/files/mijanifudelabemameveluju.pdf
    • https://cdn.shopify.com/s/files/1/0432/2535/0301/files/14395644878.pdf
    • https://cdn.shopify.com/s/files/1/0431/7829/5450/files/dasodopomux.pdf
    • https://cdn.shopify.com/s/files/1/0433/2011/5358/files/36075715795.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063e0.bin
dc902ecc4881d43a9d5e74b3c283148b0db68e66e7bca9bd2a94448ad9c6d1ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63E0 3596 bytes
font_01_sfnt_off000070c1.bin
b584ef82143a456d692eb739205059d5a2fe7f8d6708a4dc377c17b7efb92174		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70C1 5372 bytes
font_02_sfnt_off000082e9.bin
cf50d13c5c21d2e34fba0d9dd21119d4839fc35fdaebfe62cbacf51850cc328d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82E9 1936 bytes
font_03_sfnt_off00008c28.bin
4a947efbf7c0c021c265ed381db298050fcacbcf63009526bfe0407a47b85c81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C28 12532 bytes

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