Malicious PDF — malware analysis report

Static analysis result for SHA-256 548f9e0a5751d55f…

MALICIOUS

PDF

51.6 KB Created: 2020-08-04 13:13:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26bcdde532b4b22138ba5bf6a01e6f50 SHA-1: e47e1de0c5ef2f7d6a53393a8b5a7db4f72a0b38 SHA-256: 548f9e0a5751d55f78f7e1fa993fd1c0389888c0ee634fa9cb228cf924b4071c
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/pify?keyword=jef+clement+inspirerend+coachen+pdf'. Another critical heuristic identified a PDF link farm, with the first URL being 'https://cdn.shopify.com/s/files/1/0431/5506/2938/files/fudoxediroxug.pdf'. The ML classifier strongly flagged this PDF as malicious. The document body contains obfuscated text and the malicious redirector URL, suggesting an attempt to lure the user to a harmful site.

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=jef+clement+inspirerend+coachen+pdf
    • http://files.screvenmotorsports.com/uploads/1/3/1/4/131452811/litavurajerok.pdf
    • http://files.themealsmaven.com/uploads/1/3/1/4/131407877/6746353.pdf
    • http://files.teamhalbie.com/uploads/1/3/0/7/130739490/lumojegebirumevi.pdf
    • http://files.chaleffandrogers.com/uploads/1/3/2/8/132815882/lojuzabon.pdf
    • https://cdn.shopify.com/s/files/1/0431/5506/2938/files/fudoxediroxug.pdf
    • https://cdn.shopify.com/s/files/1/0432/5851/1510/files/tufami.pdf
    • https://cdn.shopify.com/s/files/1/0430/7750/1095/files/xedofememalenifufasurol.pdf
    • https://cdn.shopify.com/s/files/1/0433/8991/1194/files/xivakixilamanevetiv.pdf
    • https://cdn.shopify.com/s/files/1/0435/5473/4241/files/xezapap.pdf
    • https://cdn.shopify.com/s/files/1/0431/8189/9944/files/62000222108.pdf
    • https://cdn.shopify.com/s/files/1/0430/7265/1413/files/verizivuwosi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/telisupuf.pdf
    • https://cdn.shopify.com/s/files/1/0432/6454/0840/files/13510265912.pdf
    • https://cdn.shopify.com/s/files/1/0431/1384/0794/files/mudosug.pdf
    • https://cdn.shopify.com/s/files/1/0434/5528/3350/files/16394920870.pdf
    • https://cdn.shopify.com/s/files/1/0438/4607/4525/files/stp_oil_filters.pdf
    • https://cdn.shopify.com/s/files/1/0437/6556/3541/files/8043910264.pdf
    • https://cdn.shopify.com/s/files/1/0434/1350/4156/files/91378189560.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_off0000888e.bin
0bc64b084b979f0193cc3a50823b91a0b5d0cf79b638c3390571c0615ba25b71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x888E 5384 bytes
font_01_sfnt_off00009ab5.bin
c704ba62fe0bacea48e73915ce5cdc2774737ef47bb4f9d03011bbab57e4ba47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AB5 11608 bytes

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