Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbe764328b7554fe…

MALICIOUS

PDF

36.0 KB Created: 2020-09-19 10:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20f8fda95690135e4a1d5d3c8225c52f SHA-1: 124638a3bb859228576ec79e59ca3f32c82ca69e SHA-256: dbe764328b7554fedea0521b43e8d11d90b2ae327206c85f5bc67a5b5dfc72b8
154 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a significant number of embedded links. One of these links, 'https://ttraff.me/wix?keyword=the+lorax+worksheet', points to a known malicious redirector. The presence of a link farm suggests an attempt to distribute malicious content or phishing lures through a large number of seemingly benign PDF documents.

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.me/wix?keyword=the+lorax+worksheet
    • https://d32bd628-ee14-469a-aa40-4fbb7f78e665.filesusr.com/ugd/e745be_1d58b85717814b19a4102a71fae0cb09.pdf?index=true
    • https://2d26b2dc-7df8-4e9f-ae9b-67df4b4cedfc.filesusr.com/ugd/89064d_ed7bde6c039f4e1c834dfc97d218b90d.pdf?index=true
    • https://37a1da18-cf01-49ca-b42d-daf9baabbf07.filesusr.com/ugd/2eff39_6c5402004d0e40b686dd3ead203beca9.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0431/5512/8480/files/dha_bahawalpur_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0432/3442/7047/files/kaxomo.pdf
    • https://cdn.shopify.com/s/files/1/0483/0235/8689/files/49593926843.pdf
    • https://cdn.shopify.com/s/files/1/0429/4397/1484/files/asian_tigers_economic_development.pdf
    • https://5647f046-f6de-4d44-9d96-c39a84f2b694.filesusr.com/ugd/38eac1_626b80e70709479a89ec376f9c78960d.pdf?index=true
    • https://6dd3a29f-0aff-42dc-85ce-3fab06fc5412.filesusr.com/ugd/a382ee_7938e38241f140f89c96123c3b887f90.pdf?index=true
    • https://b565893f-c408-4559-b9bc-9fce1f859c52.filesusr.com/ugd/6dcf04_3129e132b9334983a7cc3a183f4952eb.pdf?index=true
    • https://29e10299-4d4c-46a0-b67a-65285cdbac86.filesusr.com/ugd/01e791_e8f83a19c7c94cf7a04bb8409710f7cb.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0441/4029/8392/files/zomaxa.pdf
    • https://cdn.shopify.com/s/files/1/0428/5032/0543/files/girowudoxiveselu.pdf
    • https://cdn.shopify.com/s/files/1/0433/6081/3208/files/wirerok.pdf
    • https://cdn.shopify.com/s/files/1/0434/1481/4885/files/architecture_data_warehouse.pdf
    • https://cdn.shopify.com/s/files/1/0430/8716/7645/files/ectomorph_female_transformation.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_off00005149.bin
656a2bbd420957ad99d15bf2cdd7dcd1b28e41a1be51acdc1be767fdb1968edb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5149 4948 bytes
font_01_sfnt_off00006225.bin
4d7f991571b3e8d3ac48abeb251871d9bff8b4ca7a289b863dc6d069f6f27f4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6225 9696 bytes

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