Malicious PDF — malware analysis report

Static analysis result for SHA-256 56d69a4a66974d1e…

MALICIOUS

PDF

64.4 KB Created: 2020-09-06 19:54:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b14d18fc2f0960af2dc144515a032c2 SHA-1: 9169283ce50f2006e27386e81e08529240feddcf SHA-256: 56d69a4a66974d1ec96de13ff7e50f6fbb90de0a736156f9ebcce6a1dac4daf8
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service. The primary redirector URL is identified as malicious. The document body, though heavily obfuscated, contains the same malicious redirector URL and appears to be generated by wkhtmltopdf, a tool often abused for creating malicious PDFs. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.link/wix?keyword=happiness+event+love+nikki+guide
    • https://cdn.shopify.com/s/files/1/0434/7238/8246/files/xoliwusepubu.pdf
    • https://cdn.shopify.com/s/files/1/0451/5794/1402/files/bus_eireann_109.pdf
    • https://cdn.shopify.com/s/files/1/0429/7634/6266/files/xowefabowenajufiwutu.pdf
    • https://cdn.shopify.com/s/files/1/0438/1242/1789/files/2589327778.pdf
    • https://cdn.shopify.com/s/files/1/0430/3156/0354/files/6240581052.pdf
    • https://cdn.shopify.com/s/files/1/0433/8555/3059/files/57041541891.pdf
    • https://cdn.shopify.com/s/files/1/0462/8673/3473/files/cafe_astrology_free_natal_report.pdf
    • https://cdn.shopify.com/s/files/1/0435/7790/1214/files/fenuzilejesano.pdf
    • https://cdn.shopify.com/s/files/1/0436/1663/2992/files/62446067892.pdf
    • https://cdn.shopify.com/s/files/1/0431/5371/9453/files/vukuw.pdf
    • https://cdn.shopify.com/s/files/1/0429/1375/9395/files/physics_formulas_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/7152/0414/files/toworinetavasimilos.pdf
    • https://cdn.shopify.com/s/files/1/0434/1802/6140/files/7398092311.pdf
    • https://cdn.shopify.com/s/files/1/0435/5381/6728/files/fofejefilij.pdf
    • https://cdn.shopify.com/s/files/1/0452/5201/8337/files/basic_accounting_terms_for_interview.pdf
    • https://cdn.shopify.com/s/files/1/0428/9550/7615/files/20753581327.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 8

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ad1.bin
07aa9e58b5a9dec147d1800575f089ae0ff9abcd6fcca8d6da6024145448e8be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AD1 2972 bytes
font_01_sfnt_off00006570.bin
bb1754fdae35fce3e44c7717e85e251e8a9d18bd1cec606ee6f1a5720fa7932e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6570 5116 bytes
font_02_sfnt_off000076ad.bin
78c74b1e4242eee23266b5e720e75f15d9ecb536dcdd927ea26c734178fafca6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76AD 6220 bytes
font_03_sfnt_off000085d9.bin
54cacd53223b2bc8d1c431f9f650cee10ce9541368364fdbbf68b9ebbbeb9bf5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85D9 10272 bytes
font_04_sfnt_off00009b30.bin
57f3b4d45ddd07b0d33da2fef54a589b1d3ad48efdda6101d336edd91a818376		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B30 2444 bytes
font_05_sfnt_off0000a50f.bin
bb103d48ef206be3e8241f978b46b4c795a583ee8068412ddd071687344f866d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA50F 10704 bytes
font_06_sfnt_off0000ca19.bin
30d7d3b323e761f2a418c19d00eac720c2d4197f17382751ef76f86e5bcd552d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA19 18048 bytes
font_07_sfnt_off0000e658.bin
80dfab9842fa4c5e0b6c011d396fb0db0b4e8970bdd700b4c23fc12015a9e449		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE658 2244 bytes

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