Malicious PDF — malware analysis report

Static analysis result for SHA-256 7407042c2018c600…

MALICIOUS

PDF

68.9 KB Created: 2020-08-09 10:53:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b3539daf5ddf9230b96d484a88be84af SHA-1: cbf37f1334738fbfee19c2d9b05e39f90c0e8e2d SHA-256: 7407042c2018c600d174edc318ddb33d0990657473d5b1cd2b492423b85a5d47
154 Risk Score

Malware Insights

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

The PDF contains embedded links designed to appear as legitimate content but redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL that matches the one identified by the heuristic, suggesting a lure to download further malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=famous+autobiography+books+pdf
    • http://files.slavuta-stylist.com/uploads/1/3/0/7/130739713/febaniguwobodip.pdf
    • http://files.amysteeleillustration.com/uploads/1/3/0/9/130969048/8476925.pdf
    • http://files.naturally-jo.com/uploads/1/3/1/3/131384663/xuvejekum_regibegi_givutowewuriluw_pekorinulakajut.pdf
    • http://witugaza.nettiesuze.com/uploads/1/3/1/4/131437402/8623555.pdf
    • http://nipapumu.saintjohnveinclinic.com/uploads/1/3/0/7/130775734/mebipiralavawebo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tufajotojitumawudawemir.pdf
    • https://cdn.shopify.com/s/files/1/0433/6055/1070/files/zarug.pdf
    • https://cdn.shopify.com/s/files/1/0431/7321/6411/files/lobidixeb.pdf
    • https://cdn.shopify.com/s/files/1/0439/5902/5822/files/tuwulimerinexaw.pdf
    • https://cdn.shopify.com/s/files/1/0433/4364/2773/files/1290143853.pdf
    • https://cdn.shopify.com/s/files/1/0438/2759/3376/files/catholic_study_bible_donald_senior.pdf
    • https://cdn.shopify.com/s/files/1/0432/2400/6823/files/wazikejelugoxasemalaxe.pdf
    • https://cdn.shopify.com/s/files/1/0432/2128/7080/files/phonetics_and_phonology_noun.pdf
    • https://cdn.shopify.com/s/files/1/0433/7660/7390/files/12456076051.pdf
    • https://cdn.shopify.com/s/files/1/0428/6028/2023/files/cetonas_en_orina_en_embarazo.pdf
    • https://cdn.shopify.com/s/files/1/0428/0477/3031/files/poligedimorajem.pdf
    • https://cdn.shopify.com/s/files/1/0430/4217/7181/files/71798108668.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_off0000cff1.bin
a9bd37830aed49fd7ab6096a639c1433b93aac54b6bea1ca6790735c454175b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF1 5684 bytes
font_01_sfnt_off0000e324.bin
f6ac53fe7481c7b18f2bad91588afbcacb1dee2c6bace0abe18c5d4fa151c560		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE324 10408 bytes

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