Malicious PDF — malware analysis report

Static analysis result for SHA-256 176e2d520a025544…

MALICIOUS

PDF

43.5 KB Created: 2020-08-04 08:22:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fdcbc2e829c8550d8a743ec426cffb3d SHA-1: 405f25e218f23151db07d4ef7db6dda65a282abb SHA-256: 176e2d520a025544929b8dcbd8766e3ad73cc3b22c8a5f1b6ec21d87e5c7d61a
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains numerous links, including one to a known malicious redirector at ttraff.com. The document body, though heavily obfuscated, contains text suggesting it is a 'management accounting tutorial pdf', indicating a lure. The presence of many external PDF links, some pointing to potentially malicious or algorithmically generated URLs, suggests an attempt to direct users to malicious content or a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.com/pify?keyword=management+accounting+tutorial+pdf
    • http://files.rantofaretailer.com/uploads/1/3/2/3/132302998/af4c8da2dcc.pdf
    • http://files.chestnutcenter.org/uploads/1/3/1/6/131636843/belera.pdf
    • http://files.fitzpatrickecologicalconsulting.com/uploads/1/3/1/1/131163635/09ac9c.pdf
    • http://files.naturaphysicaltherapy.org/uploads/1/3/0/7/130775808/getusipigiwefeb_joxuzurewalum_laxesanawixurel.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/9304/1053/files/53792497705.pdf
    • https://cdn.shopify.com/s/files/1/0432/8351/3499/files/55772577529.pdf
    • https://cdn.shopify.com/s/files/1/0434/3860/4450/files/wekizerapinakun.pdf
    • https://cdn.shopify.com/s/files/1/0428/8462/8633/files/deginemodotanevisoju.pdf
    • https://cdn.shopify.com/s/files/1/0437/7447/6440/files/zozepibozazakizowuwix.pdf
    • https://cdn.shopify.com/s/files/1/0428/6342/7751/files/xewigareraj.pdf
    • https://cdn.shopify.com/s/files/1/0429/9754/7157/files/83479693590.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/73121007565.pdf
    • https://cdn.shopify.com/s/files/1/0434/6845/6086/files/nokigakiwurewuzesakanine.pdf
    • https://cdn.shopify.com/s/files/1/0439/1777/0920/files/72419595583.pdf
    • https://cdn.shopify.com/s/files/1/0439/4595/1400/files/pdf_genetics_for_dummies.pdf
    • https://cdn.shopify.com/s/files/1/0431/5981/4306/files/59546107537.pdf
    • https://cdn.shopify.com/s/files/1/0433/0297/7700/files/vowez.pdf
    • https://cdn.shopify.com/s/files/1/0432/5546/4104/files/tofomufagokunadufipog.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006bec.bin
59e921874881db62626164dc163e64f1be9d43928c641f09a17bf8b427be6627		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BEC 5300 bytes
font_01_sfnt_off00007df0.bin
3f4cc25bd1fe5ddcacac2905d7ccb554b34ed01e67fe7ba9cc3f0faef2971c75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DF0 10260 bytes

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