Malicious PDF — malware analysis report

Static analysis result for SHA-256 e52bd5f4ed91b36b…

MALICIOUS

PDF

42.7 KB Created: 2020-08-05 12:22:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25f1b3ce92a1beac9d69dcc9cf539205 SHA-1: c9ac272f189a9fa6e2a6181ceeef54cf47faeade SHA-256: e52bd5f4ed91b36b66eeae2545fb7f4842fcf02f7a388abb43127ef242615ee3
154 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large number of external PDF links, indicating a link farm. The ML classifier also strongly indicated maliciousness. The embedded URLs, particularly the one pointing to 'ttraff.ru', are likely part of a phishing or malware distribution scheme. No scripts were extracted, but the sheer volume of links suggests a broad attempt to lure users to potentially harmful content.

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=a+wrinkle+in+time+final+test+pdf
    • http://files.netherlandsandcoloniesrevenues.com/uploads/1/3/0/8/130814172/54c6c.pdf
    • http://files.coastalhomeinspectionsla.com/uploads/1/3/2/7/132712088/83d9ccb.pdf
    • http://files.netaganza.com/uploads/1/3/0/7/130738716/567912.pdf
    • http://files.historyunderground.us/uploads/1/3/1/3/131398000/bedufujarum.pdf
    • http://files.happylivingmedicalsales.com/uploads/1/3/1/6/131637679/6613681.pdf
    • https://cdn.shopify.com/s/files/1/0430/2965/9797/files/subofufivabinuwemomakaz.pdf
    • https://cdn.shopify.com/s/files/1/0438/4423/9510/files/biological_weapons_convention.pdf
    • https://cdn.shopify.com/s/files/1/0430/4060/4313/files/probability_distribution_python.pdf
    • https://cdn.shopify.com/s/files/1/0431/6535/2093/files/59336484488.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/45927795399.pdf
    • https://cdn.shopify.com/s/files/1/0430/9050/9977/files/54542725410.pdf
    • https://cdn.shopify.com/s/files/1/0432/2482/6014/files/xiturixasegexoxowiwa.pdf
    • https://cdn.shopify.com/s/files/1/0438/3784/9762/files/belagav.pdf
    • https://cdn.shopify.com/s/files/1/0432/8259/6000/files/23657475577.pdf
    • https://cdn.shopify.com/s/files/1/0429/6189/5587/files/84117294480.pdf
    • https://cdn.shopify.com/s/files/1/0435/6535/1073/files/92034542935.pdf
    • https://cdn.shopify.com/s/files/1/0431/5519/4011/files/11228316064.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000687b.bin
e9520a40867ff7998364100712c9e3b165da4ef713a79d9f57ae7dc6b685d35a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x687B 5332 bytes
font_01_sfnt_off00007a9b.bin
18784957d049bd953924a95198b4b13c20db05d0a4534fbcd121e8d7930c66b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A9B 10304 bytes

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