Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7f2d4cf969563da…

MALICIOUS

PDF

48.5 KB Created: 2020-08-16 19:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38bec59ed39f1b97bb2ca07b33e696b9 SHA-1: 5e6b66224966349033e12ddfdd99a2c70456d7f4 SHA-256: b7f2d4cf969563da939d476059c652a03f53497cca62188030ecbeb0bf47ab15
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains a high density of embedded links. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which likely serves as a gateway to further malicious content. The document body contains garbled text but also includes the URL for the redirector, suggesting it is intentionally placed. The presence of numerous external PDF links, many hosted on cdn.shopify.com, indicates a link farm designed to obscure the ultimate destination and potentially improve search engine ranking for malicious content.

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=candlewood+lake+fishing+reports
    • http://gulapas.ohanahomeschool.org/uploads/1/3/1/4/131407089/64a65a.pdf
    • http://files.pestboyz.com/uploads/1/3/1/4/131454634/wigovepukovusuj_laxufisike_povakun_kakinuraxixiv.pdf
    • https://cdn.shopify.com/s/files/1/0434/0816/2974/files/88450628865.pdf
    • https://cdn.shopify.com/s/files/1/0427/6640/1692/files/vatoradogowaxezakitugadad.pdf
    • https://cdn.shopify.com/s/files/1/0431/8960/0414/files/93766928736.pdf
    • https://cdn.shopify.com/s/files/1/0446/8919/5161/files/tewufivigubajapij.pdf
    • https://cdn.shopify.com/s/files/1/0436/4356/8278/files/mijovofazexiw.pdf
    • https://cdn.shopify.com/s/files/1/0432/2469/4942/files/8825824070.pdf
    • https://cdn.shopify.com/s/files/1/0431/5162/2306/files/90085310849.pdf
    • https://cdn.shopify.com/s/files/1/0450/7897/0533/files/math_worksheets_grade_4.pdf
    • https://cdn.shopify.com/s/files/1/0431/1918/1978/files/buscopan_bula.pdf
    • https://cdn.shopify.com/s/files/1/0437/3925/0853/files/94078194365.pdf
    • https://cdn.shopify.com/s/files/1/0437/9371/1261/files/a_room_of_one_s_own_woolf.pdf
    • https://cdn.shopify.com/s/files/1/0429/5337/5897/files/57911900979.pdf
    • https://cdn.shopify.com/s/files/1/0435/3343/5039/files/shading_fractions_worksheets.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_off00007174.bin
ffd9074bebd70c69c5dbe6d515aa9c9d0f4893fd8493bff777a7c93c7c6a0b77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7174 5268 bytes
font_01_sfnt_off00008371.bin
32bc9b194773a5cef1ac04edcef020bb0dcb2c312cf15cd847cbdd5669010205		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8371 10360 bytes
font_02_sfnt_off0000a6e5.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA6E5 4324 bytes

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