Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4250f137a083923…

MALICIOUS

PDF

49.6 KB Created: 2020-09-17 16:32:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e581e3fb0135f346640f0a02ed08af3a SHA-1: 7a0b33e64d46914b893530a838023d729ad41a87 SHA-256: f4250f137a08392398f2b07aee0c53a5906800bdaa848e3c1b1a5bdab6b37007
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to domains associated with link farms and redirectors. The primary malicious link, 'https://ttraff.club/wix?keyword=te+doy+gloria+marcos+barrientos+acordes', is identified as a malicious redirector. The document body, though obfuscated, contains this URL and other PDF links, suggesting a lure to external malicious content. The ML classifier strongly indicates maliciousness.

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.club/wix?keyword=te+doy+gloria+marcos+barrientos+acordes
    • http://files.cninc.org/uploads/1/3/2/7/132740479/5324237.pdf
    • http://badesun.yanivtaubenhouse.com/uploads/1/3/0/8/130813765/bavuloxug.pdf
    • http://zuresapi.advancedanaerobics.com/uploads/1/3/1/3/131383483/rawesatubi.pdf
    • http://files.focusmachining.com/uploads/1/3/2/6/132682822/7850fdbca9cb.pdf
    • http://files.rhythmcolorassociates.com/uploads/1/3/1/4/131437037/8396531.pdf
    • https://cdn.shopify.com/s/files/1/0433/9898/7941/files/today_skymet_weather_report_in_delhi.pdf
    • https://cdn.shopify.com/s/files/1/0434/6671/9385/files/xupusivegipatuvubi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3773/6603/files/66617900466.pdf
    • https://cdn.shopify.com/s/files/1/0433/3164/9689/files/52507930860.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jisabisagubimebusogapasof.pdf
    • https://cdn.shopify.com/s/files/1/0433/3817/0526/files/char_broil_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/2326/9014/files/xotigofe.pdf
    • https://cdn.shopify.com/s/files/1/0433/4583/8239/files/aliphatic_and_aromatic_amines.pdf
    • https://cdn.shopify.com/s/files/1/0462/4351/2474/files/linus_and_lucy_guitar_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0435/3697/3983/files/best_tablet_for_reading_magazines.pdf
    • https://cdn.shopify.com/s/files/1/0434/4217/6150/files/94786746017.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_off00006821.bin
d22412b0bc22c414067ab0755ad8a368fa44f9a501a94fbb7409d61412dd9549		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6821 5240 bytes
font_01_sfnt_off000079dc.bin
bcafc907f79aaa908c23efa882845af430486e4c513e0715fbd25dc1d1ef0d2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79DC 16056 bytes
font_02_sfnt_off0000aaf8.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAAF8 4324 bytes

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