Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aee18d8e2d363f1…

MALICIOUS

PDF

51.9 KB Created: 2020-08-08 04:08:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1da32c2282f5fee113b7d63c8a15fa29 SHA-1: b64cc17161eaaeee5697325691ce1cc076f2c8b9 SHA-256: 2aee18d8e2d363f162bb8e85b7daff97c8b4808e697e4bfdabdf0773f691ab3a
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector at `https://ttraff.cc/pify?keyword=arduino+basic+projects+pdf`. The document body, though heavily obfuscated, contains text related to 'Arduino basic projects pdf', likely serving as a lure. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning attempt to drive traffic to malicious sites. The ML classifier strongly indicated 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.cc/pify?keyword=arduino+basic+projects+pdf
    • http://files.kelvynkoning.com/uploads/1/3/1/6/131606003/kuzaridawuzenefaxes.pdf
    • http://fazugo.thelackawaxenmusicfestival.com/uploads/1/3/0/9/130969723/vimofexojulan.pdf
    • http://vemarubum.ecocleancare.com/uploads/1/3/0/7/130740141/20461.pdf
    • http://files.uptildawnpaperworks.com/uploads/1/3/1/6/131607163/29b33.pdf
    • https://cdn.shopify.com/s/files/1/0433/3505/7559/files/44622093512.pdf
    • https://cdn.shopify.com/s/files/1/0434/5787/2033/files/50793250759.pdf
    • https://cdn.shopify.com/s/files/1/0435/3074/8055/files/33787491642.pdf
    • https://cdn.shopify.com/s/files/1/0436/5385/7433/files/36221334815.pdf
    • https://cdn.shopify.com/s/files/1/0431/4670/7104/files/characteristics_of_archaebacteria.pdf
    • https://cdn.shopify.com/s/files/1/0437/0720/3739/files/88134372549.pdf
    • https://cdn.shopify.com/s/files/1/0433/0058/5625/files/watch_dragonballz_episodes_online.pdf
    • https://cdn.shopify.com/s/files/1/0429/7192/2591/files/5081930115.pdf
    • https://cdn.shopify.com/s/files/1/0436/9501/4056/files/12628349896.pdf
    • https://cdn.shopify.com/s/files/1/0431/2068/9306/files/80040483639.pdf
    • https://cdn.shopify.com/s/files/1/0432/8452/9310/files/7205025502.pdf
    • https://cdn.shopify.com/s/files/1/0438/4541/9165/files/lowopelikojerunotevunabak.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_off00008045.bin
69b271deb213f67dcf99383653a71522010aac94a2363ef6a0fa81d1582ad7f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8045 5204 bytes
font_01_sfnt_off000091f7.bin
2d5c286ae1d7def7020b633322e7f09d94cf0632520287755d3d6708993977c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91F7 10056 bytes
font_02_sfnt_off0000b452.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB452 4324 bytes

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