Malicious PDF — malware analysis report

Static analysis result for SHA-256 e99f6ef849e63294…

MALICIOUS

PDF

48.6 KB Created: 2020-08-24 08:53:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa773f5fb72a4c59a6231eaf3fabe372 SHA-1: 6c02a32eeb8cbe8406cb1f78361ffde0ea9f2ebb SHA-256: e99f6ef849e632944f2edb0e1832a12d5154c3489d362ddbd0d462d92602a88a
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external resources, with one specific URL identified as a malicious redirector. The document body, though obfuscated, contains keywords related to a game and the malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier strongly supports the malicious nature of this PDF.

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=attack+on+titan+game++iphone
    • http://jejer.wallingfordmuseum.org.uk/uploads/1/3/0/7/130775088/jatotozinas.pdf
    • http://files.bwcuhrichsville.org/uploads/1/3/0/7/130776204/c656d2.pdf
    • http://gogotabi.cpfcanada.com/uploads/1/3/0/8/130874276/renemuzesetotujive.pdf
    • http://files.nigella--sativa.com/uploads/1/3/0/9/130969151/b5008c210fa19bb.pdf
    • http://files.nelsonnieves.com/uploads/1/3/1/4/131437276/bitak.pdf
    • https://cdn.shopify.com/s/files/1/0432/6824/3624/files/76222508991.pdf
    • https://cdn.shopify.com/s/files/1/0435/6302/4547/files/48201500285.pdf
    • https://cdn.shopify.com/s/files/1/0433/3826/8830/files/1351716849.pdf
    • https://cdn.shopify.com/s/files/1/0431/8124/4577/files/14745532575.pdf
    • https://cdn.shopify.com/s/files/1/0448/0984/6946/files/weather_report_for_lyndhurst_ontario.pdf
    • https://cdn.shopify.com/s/files/1/0428/1381/6995/files/73292489778.pdf
    • https://cdn.shopify.com/s/files/1/0439/0223/8875/files/islamic_baby_boy_names_in_urdu_with_meanings_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/8121/1810/files/edge_download_instead_of_opening_in_browser.pdf
    • https://cdn.shopify.com/s/files/1/0437/7496/7965/files/arkansas_fall_foliage_report_2019.pdf
    • https://cdn.shopify.com/s/files/1/0433/3476/2664/files/10514879520.pdf
    • https://cdn.shopify.com/s/files/1/0435/7678/7103/files/25011813197.pdf
    • https://cdn.shopify.com/s/files/1/0431/1836/2781/files/kannada_bhavageethe_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/50306279194.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/
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/file

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ab9.bin
d58d73c8d004576ca1b8d2e7f90a0346665907a3b53424e0d1a8f2af889550be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AB9 5092 bytes
font_01_sfnt_off00007be9.bin
fdfda15243314f3e11be5e079dce5a6f7fa4ae867947248b4f9468e54a30aeff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BE9 10632 bytes
font_02_sfnt_off0000a06e.bin
bfc441d837b7b3b6e145db50ef40ca26079b22b75b7d4883bc21c88ef510c1a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA06E 16092 bytes

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