Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d41a4c51213ff2f…

MALICIOUS

PDF

43.1 KB Created: 2020-08-19 06:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37870c8dfeb93c085c021ed3a221bb9c SHA-1: 0c9271f388bf831cd42b67d7f2a0790eeddb6e42 SHA-256: 7d41a4c51213ff2f86068d688093cbab841d72daf02e2a83ec8431946041a4fa
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a critical heuristic firing for a malicious redirector. The embedded document body text explicitly mentions 'Java 32 bit jre windows 7' and contains the malicious URL, suggesting a lure for software downloads. The primary malicious URL identified is https://ttraff.cc/pify?keyword=java+32+bit+jre+windows+7, which redirects to further 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=java+32+bit+jre+windows+7
    • http://doderu.servantyearphila.org/uploads/1/3/1/6/131636664/be872.pdf
    • http://files.moderndayseer.com/uploads/1/3/1/1/131164419/3905453.pdf
    • https://cdn.shopify.com/s/files/1/0437/7228/0981/files/wepoken.pdf
    • https://cdn.shopify.com/s/files/1/0436/1509/2894/files/cerebellar_examination.pdf
    • https://cdn.shopify.com/s/files/1/0430/5344/9365/files/75887257173.pdf
    • https://cdn.shopify.com/s/files/1/0445/4970/1796/files/spanish_words_used_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0432/2351/5300/files/arena_simulation.pdf
    • https://cdn.shopify.com/s/files/1/0431/9959/4656/files/7448454850.pdf
    • https://cdn.shopify.com/s/files/1/0432/6447/5304/files/3._5_forgotten_realms_campaign_setting.pdf
    • https://cdn.shopify.com/s/files/1/0433/1359/4526/files/repanowopevirepudatidudes.pdf
    • https://cdn.shopify.com/s/files/1/0432/4828/7904/files/raramedumukanapiwovo.pdf
    • https://cdn.shopify.com/s/files/1/0428/4976/3494/files/nupeloxetazuxe.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006278.bin
3a6325d6e7bf726d92b54ee9ae8aee9ab3d97bd5bf1f3bc3e322f471757ca8bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x6278 5520 bytes
font_01_sfnt_off0000755e.bin
1455bfc5fda696ecdaa86a92ca3900db8d0b59a0d26be3986044851260fa4e52
pdf-font-stream PDF embedded font (sfnt) at offset 0x755E 13236 bytes