Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6844aac5d43d9ca…

MALICIOUS

PDF

51.0 KB Created: 2020-08-18 15:14:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07d4e61346d42f912f7145ef295542fe SHA-1: 68d8a499976f46b1b3124d8f9daea28e4431ae0d SHA-256: a6844aac5d43d9cab14ec175a801455c5f276fd9525cfd6bc134e667e894aff9
152 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text fragments related to 'Excel macro worksheets cells' and the malicious URL. The heuristic firings confirm the presence of malicious redirector links and a link farm, indicating a likely phishing or scam delivery mechanism. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest a malicious intent to redirect the user to harmful 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.com/pify?keyword=excel+macro+worksheets+cells
    • http://dugewan.kurtplinke.com/uploads/1/3/1/3/131383309/a0d80.pdf
    • http://files.maaemi.com/uploads/1/3/1/8/131858661/simimusepaw-kolenar.pdf
    • https://cdn.shopify.com/s/files/1/0431/0378/1015/files/92583840420.pdf
    • https://cdn.shopify.com/s/files/1/0437/7575/4389/files/foriwolusunopige.pdf
    • https://cdn.shopify.com/s/files/1/0431/0463/2998/files/kaleida_think_instrumental.pdf
    • https://cdn.shopify.com/s/files/1/0432/0909/7376/files/cengage_maths_calculus.pdf
    • https://cdn.shopify.com/s/files/1/0430/7963/1012/files/80026785781.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3098/files/livro_clima_e_meio_ambiente.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/21800621301.pdf
    • https://cdn.shopify.com/s/files/1/0433/0723/7531/files/dirifopamipotez.pdf
    • https://cdn.shopify.com/s/files/1/0431/7511/6961/files/hp_1040_fax.pdf
    • https://cdn.shopify.com/s/files/1/0427/4742/9031/files/scratch_2_game_project.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006803.bin
e0fe50849c89ba9c4117dead241cc2f124b1b807c12290356a0680c42efc5a98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6803 5220 bytes
font_01_sfnt_off000079a7.bin
0549d9f72b3cc722a1bc7b0166081b0493747baff5e83ba2237f461702d560d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79A7 2936 bytes
font_02_sfnt_off000085bc.bin
e2f0ce801bf22eaeb6c2a47baae95e74e35e355e4adb26015c1567c6293d4bca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85BC 10584 bytes
font_03_sfnt_off0000aa1e.bin
d8a1a34de14a7b8fce5e51635835121d353d188f9ac9ce1e11538509fd4c5cdc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA1E 16060 bytes

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