Malicious PDF — malware analysis report

Static analysis result for SHA-256 82efd8a77ae52bc9…

MALICIOUS

PDF

54.1 KB Created: 2020-08-04 11:28:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22b49ac31128cfb75efa45a349d8111d SHA-1: a626b627faa5845c68b35bd1cfaf2c166011538d SHA-256: 82efd8a77ae52bc949dae4daff782fc3ba9a36ac97f0eeed73358a5476a77eb2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=probability+distribution+binomial+plots+calculates+the+pdf+and+cdf'. This indicates the document's primary purpose is to redirect the user to malicious infrastructure. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to improve search engine ranking for malicious content. No scripts were extracted from this sample.

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=probability+distribution+binomial+plots+calculates+the+pdf+and+cdf
    • http://files.thesilkfamilyproject.com/uploads/1/3/1/4/131437740/livig.pdf
    • http://files.lisadeakins.com/uploads/1/3/1/3/131398094/vusuza-dazumizeteje-sufoko.pdf
    • http://files.trumpsgreatamericafacts.com/uploads/1/3/1/3/131384333/41351b6e.pdf
    • http://files.skywaterlabradors.com/uploads/1/3/0/7/130775866/zukavodulama_rusifixazimos_lurabo.pdf
    • http://files.expertcharlottelocksmith.com/uploads/1/3/0/7/130738548/eb75a35e8b44.pdf
    • https://cdn.shopify.com/s/files/1/0430/1773/2249/files/boeing_787_cockpit_layout.pdf
    • https://cdn.shopify.com/s/files/1/0433/2634/1272/files/82607859735.pdf
    • https://cdn.shopify.com/s/files/1/0435/6256/5795/files/retopabijakukif.pdf
    • https://cdn.shopify.com/s/files/1/0431/1026/9082/files/nibetajidajageseruzakolud.pdf
    • https://cdn.shopify.com/s/files/1/0440/4438/6454/files/18775211387.pdf
    • https://cdn.shopify.com/s/files/1/0429/1218/6531/files/76530646779.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xefafozerokadugatevaru.pdf
    • https://cdn.shopify.com/s/files/1/0439/2720/8091/files/scarlett_2i4_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/7007/0687/files/backyard_baseball_online.pdf
    • https://cdn.shopify.com/s/files/1/0434/4948/3426/files/83042036933.pdf
    • https://cdn.shopify.com/s/files/1/0428/0477/3031/files/jusimiruba.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_off0000713e.bin
679b3de6e82cb3aae2f51fe0d1c17f6afcc02ec96f384fe8d29ce432b2de1d1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x713E 5520 bytes
font_01_sfnt_off000083c6.bin
d197c641d06403f39264dbaefc1fe87254e7a6ceb98ef0f63c5f599149b13efc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83C6 10408 bytes
font_02_sfnt_off0000a7b1.bin
f6dd43097ff77a7644066d793246590a76b2fb03a803bff94e9fefcac70f68f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7B1 16084 bytes
font_03_sfnt_off0000bc5e.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC5E 4324 bytes

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