Malicious PDF — malware analysis report

Static analysis result for SHA-256 98c19cb495c2fc1d…

MALICIOUS

PDF

56.7 KB Created: 2020-08-30 11:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f96f6be51d7af7767b8c9e9e9a419056 SHA-1: 313b4dc9c743bc680336e2f8da81ac90b1d443cb SHA-256: 98c19cb495c2fc1de789cc8e4a022dd025e6b057a99426eb8f3c2d9a37ab6af9
128 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.001 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/wix?keyword=mxq+pro+update+to+android+7.1'. This URL is presented within the document body, disguised as a software update for Android. The document also contains a PDF link farm heuristic, with many links pointing to Shopify-hosted PDFs, one of which is 'https://cdn.shopify.com/s/files/1/0429/5468/6620/files/vistas_workbook_answer_key.pdf'. The presence of a download button lure further supports the malicious intent.

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.
  • 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
  • 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/wix?keyword=mxq+pro+update+to+android+7.1
    • https://cdn.shopify.com/s/files/1/0429/5468/6620/files/vistas_workbook_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/45397061855.pdf
    • https://cdn.shopify.com/s/files/1/0433/9659/5870/files/gentleman_s_guide_cast.pdf
    • https://cdn.shopify.com/s/files/1/0430/6409/8970/files/gujufiz.pdf
    • https://cdn.shopify.com/s/files/1/0431/1361/1421/files/air_cooled_heat_exchanger_design_calculation.pdf
    • https://cdn.shopify.com/s/files/1/0431/4093/9933/files/1808507677.pdf
    • https://cdn.shopify.com/s/files/1/0427/5906/1670/files/30393003167.pdf
    • https://cdn.shopify.com/s/files/1/0429/5049/2316/files/79691453347.pdf
    • https://cdn.shopify.com/s/files/1/0450/3266/9334/files/nujomulixibebuliwunuta.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/63537272249.pdf
    • https://cdn.shopify.com/s/files/1/0428/6126/5062/files/genesis_bible_study_workbook.pdf
    • https://cdn.shopify.com/s/files/1/0437/8548/6485/files/amazing_grace_lyrics_and_chords.pdf
    • https://static.usrfiles.com/ugd/be19e1_36b934adf8fd4e6096d39fefb52a091c.pdf
    • https://static.usrfiles.com/ugd/b8c837_30c2c394a7de43c1b808a586a801eb80.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008229.bin
978337ebaa25fb156953a868c834031f00ead54803ba5dd4389a69ee07377ccc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8229 4988 bytes
font_01_sfnt_off00009338.bin
6d2a3a16cc464ce72cf05976c7f96a31c93af2202e0dc760c37a694345e222ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9338 1800 bytes
font_02_sfnt_off00009bc8.bin
412e4ea76ffd0bf48c8fb9e66f40acf70cfcb96ed877d52c66052c0cc92f0973		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BC8 13768 bytes
font_03_sfnt_off0000c74c.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC74C 4324 bytes

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