Malicious PDF — malware analysis report

Static analysis result for SHA-256 b83882e6f6488b2f…

MALICIOUS

PDF

57.8 KB Created: 2020-08-17 05:30:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1555030af86875c0a84589b17b7b822 SHA-1: 0192327e4aa7622e2f8975c60b36970f25047030 SHA-256: b83882e6f6488b2fa5f07227af0e86c3e85fab63ebd72371321ad7a118248980
138 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a critical heuristic firing for a malicious redirector link. The document body, though heavily obfuscated, contains text related to an 'answer key' and includes the malicious URL. This suggests a social engineering lure to trick users into visiting a malicious site, likely to download further malware. The PDF also contains a large number of external links, many hosted on Shopify, which is indicative of a link farm used for SEO poisoning or to obscure the true destination.

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.com/pify?keyword=rrb+allahabad+group+d+answer+key+2018
    • http://files.isabeltamouro.com/uploads/1/3/0/7/130739011/1476220.pdf
    • http://files.thespareroombook.com/uploads/1/3/0/9/130968984/3f710250c8e.pdf
    • https://cdn.shopify.com/s/files/1/0429/1549/6092/files/bebifewufi.pdf
    • https://cdn.shopify.com/s/files/1/0432/5546/4104/files/61428545830.pdf
    • https://cdn.shopify.com/s/files/1/0439/8632/1566/files/patinomolenududuxiseje.pdf
    • https://cdn.shopify.com/s/files/1/0429/9948/0473/files/24801835621.pdf
    • https://cdn.shopify.com/s/files/1/0432/0077/4307/files/sandy_hook_fishing_report.pdf
    • https://cdn.shopify.com/s/files/1/0429/2893/0979/files/caddisflies_the_underwater_architects.pdf
    • https://cdn.shopify.com/s/files/1/0437/5596/2522/files/5900820054.pdf
    • https://cdn.shopify.com/s/files/1/0434/8339/8310/files/bugubinawaki.pdf
    • https://cdn.shopify.com/s/files/1/0438/3876/7266/files/90712801214.pdf
    • https://cdn.shopify.com/s/files/1/0435/2652/0986/files/edit_text_in_bluebeam_revu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1003/0748/files/dragon_nest_sea_2018_leveling_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/5661/0969/files/du_ma_sociology_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0434/2562/8327/files/iana_time_zones.pdf
    • https://cdn.shopify.com/s/files/1/0437/2103/1829/files/cypress_hill_discography.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000071b1.bin
518e3c41ddb0a0a2334a3303ea0c587e1555d46851d0930e64957297e547cc7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71B1 5900 bytes
font_01_sfnt_off000085bd.bin
19d579821e83c32cd478aefcb57f849508ece8625c42f2108810477b29a00d2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85BD 1936 bytes
font_02_sfnt_off00008f03.bin
f2bbd82c223aac8bc4fdd766a3826996738cee009d706414141d9e12519fe2a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F03 11808 bytes
font_03_sfnt_off0000b604.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB604 4324 bytes
font_04_sfnt_off0000c405.bin
fca21d4273244dd101645064fa1c5b211da67d4e89545faa370275dfb5eadea9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC405 6028 bytes

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