Malicious PDF — malware analysis report

Static analysis result for SHA-256 668ac51b08ecb341…

MALICIOUS

PDF

49.1 KB Created: 2020-09-12 18:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3c53aa6d0ed89a9ddd5b811ea12177e SHA-1: 4b4887b0a85ff28c01ace96143db5b8b0f40ed70 SHA-256: 668ac51b08ecb341dc98508b673a53cd567a4d635697eab5d3d1c3605037d4d0
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF contains multiple embedded links, with one specifically identified as a redirector to malicious infrastructure. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a malicious intent to trick users into clicking the link, likely leading to malware download. The document body and extracted URLs suggest a lure related to downloading an 'apk' file.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.me/wix?keyword=fildo+latest+apk
    • http://files.tilthrestaurant.com/uploads/1/3/1/3/131380345/zokarinuka_musilaxojenixam_viwurekitututax.pdf
    • http://files.elkcreekbaptist.com/uploads/1/3/1/4/131484029/8705695.pdf
    • http://files.bayareavocalimprov.com/uploads/1/3/1/3/131382470/kedimare.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/c7ef1a_d71f3791c87d41658fd80149086efb9f.pdf
    • https://static.usrfiles.com/ugd/ae059d_7ec84361b34c410ba211932c197fba84.pdf
    • https://static.usrfiles.com/ugd/b1dabf_bb90d23066a44038aa5daec3c1c1a788.pdf
    • https://static.usrfiles.com/ugd/e5cbe5_45943e03a08a4ef88b4ea0a5510529bb.pdf
    • https://static.usrfiles.com/ugd/787b0a_2330e839df2e42a38c74ff49252ebe55.pdf
    • https://static.usrfiles.com/ugd/d54300_ad5b7cdbaee64f7ca08feff4fd0657d8.pdf
    • https://static.usrfiles.com/ugd/17beed_0f6ce98cd3ab4db999caf3e513c7bd1b.pdf
    • https://static.usrfiles.com/ugd/0994f9_8d2a79ce449e474380db1f3af0f95597.pdf
    • https://static.usrfiles.com/ugd/79e0dc_401f2555bfbe4dc89ea8ee2ef0da6af2.pdf
    • https://cdn.shopify.com/s/files/1/0431/9959/4656/files/gewesidenowazugupidi.pdf
    • https://cdn.shopify.com/s/files/1/0434/2376/0536/files/68040273056.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_off000084c3.bin
c3d56e8137e3c8c4e53b165c9c397c9a8641a51db7895dc3d6913be56032a19a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84C3 4876 bytes
font_01_sfnt_off00009570.bin
0dfcb1dcd2d6ebc9542aec515a47f9146b5a767c902cc67051d9373d83ffcfb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9570 10120 bytes

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