Malicious PDF — malware analysis report

Static analysis result for SHA-256 cec16c42ef6546c0…

MALICIOUS

PDF

46.0 KB Created: 2020-08-19 13:40:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9fb42583414865434809937991e1062 SHA-1: afb134e35b6d055ae8e94b4c378fb9228158c718 SHA-256: cec16c42ef6546c01910809682050bff6e75088460262ea9f3c6489ad9528c75
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'adding subtracting integers worksheets pdf' and the malicious URL. This suggests a social engineering lure to drive traffic to a malicious site, likely for further exploitation or credential harvesting.

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=adding+subtracting+integers+worksheets+pdf
    • http://files.inspectnj.net/uploads/1/3/2/6/132680967/3928339.pdf
    • http://files.themadamestusk.com/uploads/1/3/0/7/130739366/konudijo_fewaxinuja_xuluxot_bubitaf.pdf
    • https://cdn.shopify.com/s/files/1/0432/7650/1147/files/16716985794.pdf
    • https://cdn.shopify.com/s/files/1/0429/1896/9507/files/cbit_placements.pdf
    • https://cdn.shopify.com/s/files/1/0432/5428/4450/files/convert_base64_to_jquery.pdf
    • https://cdn.shopify.com/s/files/1/0433/8280/0542/files/21462276156.pdf
    • https://cdn.shopify.com/s/files/1/0445/3682/3972/files/verb_dictionary_english_to_marathi.pdf
    • https://cdn.shopify.com/s/files/1/0437/6369/5770/files/time_and_work_aptitude_problems.pdf
    • https://cdn.shopify.com/s/files/1/0431/3425/5258/files/8191970807.pdf
    • https://cdn.shopify.com/s/files/1/0429/2860/3295/files/kovupugixivojodujedevo.pdf
    • https://cdn.shopify.com/s/files/1/0430/3051/1779/files/dozujituvepama.pdf
    • https://cdn.shopify.com/s/files/1/0429/2739/0887/files/15893983032.pdf
    • https://cdn.shopify.com/s/files/1/0450/9014/4421/files/momotibaruderi.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_off00006af7.bin
1469ec81a759cfb00a46bcef309360e4c37731c1f4101f0199021836448bb6a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AF7 5672 bytes
font_01_sfnt_off00007e3d.bin
40d78e5b58076cb8c5710f6a9cbbb9810fa0081b776e7c15443ee1f4af9fe030
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E3D 14212 bytes