Malicious PDF — malware analysis report

Static analysis result for SHA-256 e90b14c5d5d02ff8…

MALICIOUS

PDF

41.3 KB Created: 2020-08-22 02:18:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf54727dc2ddb8ce11929ea505da2d53 SHA-1: e6ee0adc42de1e1247b22330d1d4c74a2f65940d SHA-256: e90b14c5d5d02ff8b92c6321f825ee86ff2866183cbaa99842a0adf36763c796
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, characteristic of a link farm designed to distribute traffic or host malicious content. One of the primary links directs to a known malicious redirector, indicating a potential phishing or malware distribution attempt. 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=chocolate+song+masstamilan
    • http://retori.neora.ca/uploads/1/3/2/7/132740805/9ec23.pdf
    • http://files.bombni.com/uploads/1/3/0/7/130775520/6994652.pdf
    • http://noregor.motscatering.com/uploads/1/3/0/7/130776688/widudigu_kaxojodorixokav_lisififi_sebamigojux.pdf
    • http://nojapos.jayrographics.com/uploads/1/3/0/7/130775982/mafesefotijurupokaj.pdf
    • http://rejapoxu.diminexnz.com/uploads/1/3/0/7/130775126/bimomomegupidepep.pdf
    • https://cdn.shopify.com/s/files/1/0431/1692/0996/files/gupikuvanu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6213/2897/files/21256992952.pdf
    • https://cdn.shopify.com/s/files/1/0428/9508/1625/files/83645794119.pdf
    • https://cdn.shopify.com/s/files/1/0433/4721/4486/files/75405729257.pdf
    • https://cdn.shopify.com/s/files/1/0433/6523/6901/files/google_drive_apkmirror.pdf
    • https://cdn.shopify.com/s/files/1/0431/6292/7253/files/commandant_s_reading_list_2020.pdf
    • https://cdn.shopify.com/s/files/1/0435/8579/8301/files/kubanelitekevapomawirut.pdf
    • https://cdn.shopify.com/s/files/1/0427/4615/1078/files/14307793912.pdf
    • https://cdn.shopify.com/s/files/1/0436/6031/2741/files/android_microsoft_exchange_activesync_setup.pdf
    • https://cdn.shopify.com/s/files/1/0431/4864/0418/files/vawefofotujegereduduj.pdf
    • https://cdn.shopify.com/s/files/1/0433/2562/0374/files/labefigogilipozobigoruw.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005444.bin
9f668b30a1fda0c425e8a7c0237645248db30f712bb7ec29ff58753076d09343		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5444 4928 bytes
font_01_sfnt_off000064d2.bin
60359907dad53fd83b533df04141c863e924ba68d956ec679ce210c9c0222782		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64D2 10608 bytes
font_02_sfnt_off000088eb.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88EB 4324 bytes

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